mercredi 27 avril 2022

The Crew-4 Astronauts Dock to the Space Station

 







NASA / SpaceX - Dragon Crew-4 Mission patch.


April 27, 2022

NASA astronauts Kjell Lindgren, Bob Hines, and Jessica Watkins, and ESA (European Space Agency) astronaut Samantha Cristoforetti arrived at the International Space Station Wednesday, April 27, as the SpaceX Dragon Freedom docked to the complex at 7:37 p.m. EDT while the spacecraft were flying about 261 miles above the Pacific Ocean.


Image above: The SpaceX Dragon Freedom capsule is seen after docking to the International Space Station while the station was orbiting 261 statute miles above the Pacific Ocean. Image Credit: NASA TV.

Following Crew Dragon’s link up to the Harmony module, the astronauts aboard Dragon and the space station will begin conducting standard leak checks and pressurization between the spacecraft in preparation for hatch opening.

Lindgren, Hines, Watkins, and Cristoforetti will join the Expedition 67 crew of Raja Chari, Thomas Marshburn, and Kayla Barron, all of NASA, Matthias Maurer of ESA, and cosmonauts Oleg Artemyev, Sergey Korsakov, and Denis Matveev of Roscosmos. For a short time, the number of crew on the space station will increase to 11 people until NASA’s SpaceX Crew-3 departs in early May.

SpaceX Crew-4 docking

NASA Television, the NASA app, and the agency’s website are providing ongoing live coverage through hatch opening. NASA also will cover the ceremony to welcome the crew aboard the orbital outpost about 2:40 a.m. Thursday, April 28.

Related articles:

Crew-4: NASA TV Coverage Continues, Dragon Ahead of Schedule for Docking
https://orbiterchspacenews.blogspot.com/2022/04/crew-4-nasa-tv-coverage-continues.html

NASA’s SpaceX Crew-4 Astronauts Launch to International Space Station
https://orbiterchspacenews.blogspot.com/2022/04/nasas-spacex-crew-4-astronauts-launch.html

Crew-4 Astronauts Head to Space Station to Conduct Microgravity Science
https://orbiterchspacenews.blogspot.com/2022/04/crew-4-astronauts-head-to-space-station.html

Related links:

NASA TV: https://www.nasa.gov/live

International Space Station (ISS): https://www.nasa.gov/mission_pages/station/main/index.html

Image (mentioned), Video, Text, Credits: NASA/Heidi Lavelle/NASA TV/SciNews.

Greetings, Orbiter.ch

Crew-4: NASA TV Coverage Continues, Dragon Ahead of Schedule for Docking

 







NASA / SpaceX - Dragon Crew-4 Mission patch.


April 27, 2022

NASA Television, the NASA app, and the agency’s website are providing live continuous coverage of NASA’s SpaceX Crew-4 mission carrying NASA astronauts Kjell Lindgren, Bob Hines, and Jessica Watkins, and ESA (European Space Agency) astronaut Samantha Cristoforetti on their way to the International Space Station.The Crew Dragon spacecraft, named Freedom, is about 45 minutes ahead of the planned mission timeline. Docking to the space-facing port of the station’s Harmony module now is expected about 7:40 p.m. EDT Wednesday, April 27.


Image above: NASA astronaut and SpaceX Crew-4 Commander Kjell Lindgren, representing NASA’s Commercial Crew Program, is pictured during a training session inside a mockup of the Crew Dragon vehicle at SpaceX Headquarters in Hawthorne, California on Feb. 15, 2022. Image Credits: NASA/SpaceX.

Crew-4 astronauts launched to International Space Station at 3:52 a.m. Wednesday, April 27, from Launch Complex 39A at NASA’s Kennedy Space Center in Florida.

Related articles:

NASA’s SpaceX Crew-4 Astronauts Launch to International Space Station
https://orbiterchspacenews.blogspot.com/2022/04/nasas-spacex-crew-4-astronauts-launch.html

Crew-4 Astronauts Head to Space Station to Conduct Microgravity Science
https://orbiterchspacenews.blogspot.com/2022/04/crew-4-astronauts-head-to-space-station.html

Related links:

NASA TV: https://www.nasa.gov/live

International Space Station (ISS): https://www.nasa.gov/mission_pages/station/main/index.html

Image (mentioned), Text, Credits: NASA/Heidi Lavelle.

Best regards, Orbiter.ch

NASA Celebrates Three Years of Astrobees Buzzing on Space Station

 







ISS - Astrobee Mission patch.


April 27, 2022

Three years ago, a pair of robots were launched to the International Space Station to help pave the way for the future of robotics and autonomous systems in space. Those pioneers were Honey and Bumble, who were soon joined by a third companion called Queen, and together they make up the Astrobee free-flying robotic system. Robots like the Astrobees are essential components of NASA’s Artemis mission to deliver humans back to the Moon, before traveling to Mars and beyond.


Image above: NASA astronaut Shane Kimbrough poses aboard the International Space Station with all three Astrobee robotic free-flyers. Image Credits: NASA/Shane Kimbrough.

“There’s a reason so many science fiction stories have a beloved robot alongside the human heroes – we know we can’t explore space alone,” said Jose Benavides, the Astrobee Facilities Project Manager at NASA’s Ames Research Center in California’s Silicon Valley. “We’re showing that humans and robotic systems can collaborate and support powerful science and engineering beyond Earth.”

Since launch, the Astrobee program – run out of NASA Ames – has operated over 750 hours on the space station, completing over 100 activities, from tech demonstrations to assisting in experiments. The robots have proven capable of feats previously in the realm of science fiction, such as detecting an anomaly during a simulation on station and connecting autonomously with station subsystems. Honey, Bumble, and Queen have been busy bees, and they show no signs of slowing down.

Three Years of Evolving Astrobees

The Astrobees are a next-generation technology, building upon three orb-shaped robots of the Synchronized Position Hold, Engage, Reorient, Experimental Satellite (SPHERES) project. Astrobees evolved from that initial concept as researchers developed new tools and capabilities.

They fly through microgravity using electric fans, they “see” using cameras and sensors, and they have arms to hold objects or keep steady for tasks requiring stability. Researchers have also tested an adhesive technology, inspired by gecko feet, to allow the Astrobees to grab onto a variety of surfaces without applying force to adhere and then detach on demand. The Astrobee teams envision a robotic system that’s smart and versatile enough to handle simpler maintenance and monitoring chores to leave astronauts free to tackle more complex work.

Astrobee

But the Astrobee platform isn’t just for astronauts. Through the annual Kibo Robot Programming Challenge, operated alongside the Japan Aerospace Exploration Agency (JAXA) and now in its third year, students from across the world can write code for the Astrobees. The winning teams get to see their programs run on the robots in space. Inspiring the next generation of programmers and engineers is vital as NASA prepares for a future where robotics will play a central role in humanity’s exploration beyond our planet.

Robotic Autonomy for Artemis and Beyond

Unlike the space station, future deep space outposts may not be crewed year-round, and will need autonomous systems to remain operational. That includes Gateway, which will orbit the Moon and serve as a launching-point for missions to Mars.


Image above: NASA astronaut and Expedition 65 Flight Engineer Megan McArthur observes Astrobee robot Honey during an experiment testing its ability to “listen” to station components to help detect anomalies in spacecraft systems that may need servicing. Image Credit: NASA.

The Integrated System for Autonomous and Adaptive Caretaking project (ISAAC) aims to test how robotic systems can complete tasks like repairs, maintenance, and even experiments independently.

By giving Honey and Bumble challenges to solve on their own – like removing a “sock” blocking an air vent – ISAAC is building capabilities needed for robots to take care of spacecraft when astronauts aren’t aboard. But a major component of autonomously operating in a complex environment is being able to have a detailed map and know where you are.

ISAAC’s two most recent demonstrations used Astrobees to create 3D maps of the space station’s interior. Bumble flew out of its home module and mapped out a new environment on its own. The ability to explore and map independently is essential to the future of autonomous robotics.

“Three years ago, we wanted to test out how robotics could support human space exploration, not just for this decade, but for the next several decades,” said ISAAC deputy project manager Maria Bualat at Ames. “We’re starting to see what that’ll look like.”

Astrobee and ISAAC were funded by NASA’s Game Changing Development Program, part of the Space Technology Mission Directorate.

Related links:

Kibo Robot Programming Challenge: https://jaxa.krpc.jp/

Astrobee: https://www.nasa.gov/mission_pages/station/research/experiments/explorer/Facility.html?#id=1891

Space Station Research and Technology: https://www.nasa.gov/mission_pages/station/research/overview.html

International Space Station (ISS): https://www.nasa.gov/mission_pages/station/main/index.html

Images (mentioned), Animation, Text, Credits: NASA/Author: Frank Tavares, NASA's Ames Research Center.

Greetings, Orbiter.ch

NASA’s SpaceX Crew-4 Astronauts Launch to International Space Station

 







NASA / SpaceX - Dragon Crew-4 Mission patch.


April 27, 2022

NASA’s SpaceX Crew-4 astronauts are in orbit following their launch to the International Space Station at 3:52 a.m. EDT Wednesday, April 27, from Launch Complex 39A at NASA’s Kennedy Space Center in Florida. The international crew of astronauts will serve as the fourth commercial crew rotation mission aboard the space station.


Image above: A SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft is launched on NASA’s SpaceX Crew-4 mission to the International Space Station with NASA astronauts Kjell Lindgren, Robert Hines, Jessica Watkins, and ESA (European Space Agency) astronaut Samantha Cristoforetti onboard, Wednesday, April 27, 2022, at NASA’s Kennedy Space Center in Florida. Image Credits: NASA/Aubrey Gemignani.

A SpaceX Falcon 9 rocket propelled the Dragon spacecraft into orbit carrying Mission Commander Kjell Lindgren, Pilot Bob Hines, and Mission Specialist Jessica Watkins, all NASA astronauts, and Mission Specialist Samantha Cristoforetti of ESA (European Space Agency). The crew will conduct a science expedition in microgravity aboard the space station.

“Liftoff! The past few days at Kennedy Space Center have been inspiring and busy with the return of the Axiom crew and now the successful launch of Crew-4 astronauts to the International Space Station,” said NASA Administrator Bill Nelson. “Aboard station, Kjell, Bob, Jessica, and Samantha will carry out research investigations that will help NASA prepare for longer duration stays on the Moon – and eventually Mars. These missions wouldn’t be possible without the dedicated NASA and SpaceX teams here on Earth. Godspeed, Crew-4!”

This Crew-4 mission is the first launch for Hines and Watkins, and the second flight to the station for Lindgren and Cristoforetti. It launched in a new Dragon spacecraft, named Freedom by the crew, and a Falcon 9 booster flying its fourth mission into space. This is the fifth SpaceX flight with NASA astronauts – including the Demo-2 test flight in 2020 to the space station – as part of the agency’s Commercial Crew Program.

SpaceX Crew-4 launch highlights

During Dragon’s flight, SpaceX will monitor a series of automatic spacecraft maneuvers from its mission control center in Hawthorne, California, and NASA teams will monitor space station operations throughout the flight from the Mission Control Center at the agency’s Johnson Space Center in Houston.

Dragon will dock autonomously to the space-facing port of the station’s Harmony module around 8:15 p.m. Wednesday, April 27. NASA Television, the NASA app, and the agency’s website are providing ongoing live coverage through docking, and hatch opening. NASA also will cover the ceremony to welcome the crew aboard the orbital outpost about 2:40 a.m. on Thursday, April 28.

“NASA, SpaceX and our international partners have worked tirelessly to ensure that the International Space Station continues conducting important research in microgravity, and working on a whole host of activities that benefit humanity and opens up access to more people in space,” said Kathryn Lueders, associate administrator for NASA’s Space Operations Mission Directorate in Washington. “Crew-4’s launch, less than two days after the return of the first all-private mission to station, exemplifies the spirit and success of the Commercial Crew Program to help maximize use of low-Earth orbit for years to come, testing the technologies we need for the Artemis program and beyond.”

Lindgren, Hines, Watkins, and Cristoforetti will join the space station’s Expedition 67 crew of Raja Chari, Thomas Marshburn, and Kayla Barron, all NASA astronauts, Matthias Maurer of ESA, and cosmonauts Oleg Artemyev, Sergey Korsakov, and Denis Matveev of Roscosmos. For a short time, the number of crew aboard the space station will increase to 11 people until Crew-3 astronauts Chari, Marshburn, Barron, and Maurer return to Earth a few days later.

NASA’s SpaceX Crew-4 astronauts. Image Credits: SpaceX/NASA

Crew-4 is the third commercial crew mission to fly an ESA astronaut.

“It gives me great pleasure to see the successful launch of Samantha Cristoforetti and her Crew-4 colleagues. Samantha will take over from Matthias Maurer and continue to represent Europe and support European experiments aboard the space station throughout her mission,” says ESA Director General Josef Aschbacher.

ESA Director of Human and Robotic Exploration David Parker adds, “Samantha has been an excellent role model – even more so as on the space station she will take on the role of USOS lead, responsible for operations within the U.S. Orbital Segment of the International Space Station, comprising of American, European, Japanese and Canadian modules and components.”

The Crew-4 astronauts will spend several months aboard the space station conducting new scientific research in areas such as materials science, health technologies, and plant science to prepare for human exploration beyond low-Earth orbit and to benefit life on Earth.

The Crew-4 mission continues NASA’s efforts to maintain American leadership in human spaceflight. Regular, long-duration commercial crew rotation missions enable NASA to continue the important research and technology investigations taking place aboard the station. Such research benefits people on Earth and lays the groundwork for future exploration of the Moon and Mars, starting with the agency’s Artemis missions, which includes landing the first woman and person of color on the lunar surface.

Lindgren is commander of the Dragon spacecraft and the Crew-4 mission. He is responsible for all phases of flight, from launch to re-entry, and will serve as an Expedition 67 flight engineer. This will be Lindgren’s second spaceflight since becoming an astronaut in 2009. In 2015, he spent 141 days aboard the orbital laboratory as a flight engineer for expeditions 44 and 45. Board certified in emergency medicine, he previously worked at NASA Johnson as a flight surgeon supporting space station training and operations and served as a deputy crew surgeon for space shuttle flight STS-130 and Expedition 24. Lindgren was born in Taipei, Taiwan, and spent most of his childhood in England before graduating from the U.S. Air Force Academy.

Hines is the pilot of the Dragon spacecraft and second in command for the mission. He is responsible for spacecraft systems and performance. Aboard the station, he will serve as an Expedition 67 flight engineer. This will be his first flight since his selection as an astronaut in 2017. Hines has served more than 22 years in the U.S. Air Force as a test pilot, fighter pilot, and instructor pilot. Before his selection in 2017, he was a research pilot at Johnson.

Watkins is a mission specialist for Crew-4 and will work closely with the commander and pilot to monitor the spacecraft during the dynamic launch and re-entry phases of flight. Once aboard the station, she will seve as a flight engineer for Expedition 67. Watkins grew up in Lafayette, Colorado, and studied geology at Stanford University, Palo Alto, California, and the University of California, Los Angeles. As a geologist, she studied the surface of Mars and was a science team collaborator at NASA’s Jet Propulsion Laboratory in Pasadena, California, working on the Mars Science Laboratory rover Curiosity. She also was selected as a NASA astronaut in 2017, and this will be her first trip to space.

Cristoforetti will also serve as a mission specialist, working to monitor the Dragon spacecraft during the dynamic launch and re-entry phases of flight. She will serve as a flight engineer for Expedition 67. This will be her second trip to space following five months in 2015 as a flight engineer for Expeditions 42 and 43. Born in Milan, Italy, she was a fighter pilot in the Italian Air Force prior to being selected as an ESA astronaut in 2009. In 2019, she served as commander for NASA’s 23rd Extreme Environment Mission Operations mission on a 10-day stay in Aquarius, the world’s only undersea research station.

Learn more about NASA’s SpaceX Crew-4 and Commercial Crew Program at:

https://www.nasa.gov/commercialcrew

International Space Station (ISS): https://www.nasa.gov/mission_pages/station/main/index.html

Images (mentioned), Video, Text, Credits: NASA/Robert Margetta/Josh Finch/Gina Anderson/KSC/Brittney Thorpe/Kathleen Haas Ellis/JSC/Dylan Connell/Dan Huot/NASA TV/SciNews.

Best regards, Orbiter.ch

mardi 26 avril 2022

An Angel Wing in Space

 






NASA - Hubble Space Telescope patch.


April 26, 2022


This Hubble Space Telescope image features two merging galaxies in the VV-689 system, nicknamed the Angel Wing. Unlike chance alignments of galaxies, which only appear to overlap when viewed from our vantage point on Earth, the two galaxies in VV-689 are in the midst of a collision. The galactic interaction has left the VV-689 system almost completely symmetrical, giving the impression of a vast set of galactic wings.

“Zoo Gems,” interesting galaxies from the Galaxy Zoo citizen science project is a crowdsourced program and relies on hundreds of thousands of volunteers to classify galaxies and help astronomers wade through a deluge of data from robotic telescopes. In the process, volunteers discovered a gallery of weird and wonderful galaxy types, some not previously studied. A similar, project called Radio Galaxy Zoo: LOFAR is using the same crowdsourcing approach to locate supermassive black holes in distant galaxies.

Hubble Space Telescope (HST)

For more information about Hubble, visit:

http://hubblesite.org/

http://www.nasa.gov/hubble

http://www.spacetelescope.org/

Image, Animation Credits: ESA/Hubble & NASA, W. Keel; Acknowledgment: J. Schmidt/Text Credits: ESA/NASA/Yvette Smith.

Greetings, Orbiter.ch

Keeper of the winds shines on

 





ESA - Aeolus Mission logo.


April 26, 2022

Launched back in 2018, Aeolus has outlived its 36-month in-orbit design life – but going above and beyond, it continues to deliver excellent data. This shows that there’s life yet in the satellite, meaning ESA’s wind mission is now expected to continue shining a light on the wind for another year.

Heralding the start of the Aeolus Third Anniversary Conference in Taormina, Sicily, which highlighted the continued importance of this pioneering wind mission, the Aeolus Mission Manager, Tommaso Parrinello, said, “I believe that the best is still to come, and I’m pleased to announce that with a switch of the laser we are extending the lifetime of this remarkable mission hopefully for another year.”

Named after Aeolus, who in Greek mythology was appointed ‘keeper of the winds’ by the Gods, Aeolus is a one-of-a-kind satellite that measures wind from space. It is one of ESA’s Earth Explorers missions, which use advanced space technologies to answer critical questions about Earth’s natural processes and the impact that human activity is having.

Understanding Earth’s winds

Pulses of ultraviolet light fired from Aeolus’ ALADIN laser towards Earth are reflected from air molecules and particles in the atmosphere. Two optical analysers measure the Doppler shift of the molecular scattering, ‘Rayleigh’, and scattering from aerosols and water droplets, ‘Mie’. By analysing these Doppler shifts, it is possible to estimate wind speed and direction at various altitudes worldwide, making Aeolus the first satellite mission to deliver profiles of Earth’s wind on a global scale.

The uses for Aeolus wind data are many, from predicting the weather and improving climate models, to tracking events in near-realtime, such as the recent Hunga Tonga volcanic eruption.

Despite exceeding its initial lifetime, meteorology experts at the Taormina conference expressed the value Aeolus data continue to have.

Aeolus improves wind measurements

“Forecast Sensitivity Observation Impact shows that Aeolus is amongst the most important satellite missions, which is an impressive result for a demonstrator,” said Mike Rennie of the European Centre for Medium Range Weather Forecasts (ECMWF).

Nothing connects us quite like the weather. Whether it’s to understand what coat to wear, or to determine climate expectations tomorrow, being able to predict it as accurately as possible is key.

Although Mike showed that although the positive impact of the data obtained in 2019 was roughly twice as big as it is now, Aeolus is still proving useful for numerical weather prediction.

“Although the Rayleigh impact is gradually declining as the instrument noise increases, the Forecast Sensitivity Observation Impact shows that Aeolus is still beneficial,” added Mike.

Gemma Halloran of the UK Met Office, where an expanded Aeolus dataset will be operational in May, concurred, saying, “Almost all weather models improved with the assimilation of Aeolus data.”

Vivien Pourret of Météo France also presented data that put Aeolus amongst the best instruments for improving weather forecasts, third overall in terms of improvement per observation. He noted, “The goal is to operationally assimilate Aeolus data for as long as possible.”

Tonga volcanic ash plume leaves its mark in Aeolus data

Aeolus helped track Hunga Tonga eruption

Aeolus is also proving helpful for tracking events such as volcanic eruptions, thanks to near-realtime data reaching the user within three hours via the Aeolus Virtual Research Environment. Earlier this year, scientists working on the Aeolus Data Science Innovation Cluster used the online visualisation tool to track the Hunga Tonga volcanic eruption.

On 15 January 2022, a huge blip, or drop, in the Aeolus signal over the region of the eruption suggested the plume of volcanic ash must have reached an altitude above the range of Aeolus, as shown in the image above. The image below uses data from three days later, from 18 January, and shows how Aeolus could track the volcanic plume widening and spreading westwards over Australia.

Spread of Tonga volcanic ash shown in Aeolus data on 18 January 2022

After increasing the satellite’s range of measurements, by the end of January the whole plume was clearly visible in the stratosphere.

The usefulness of such analyses was made clear by Anna Kampouri of the National Observatory of Athens, who in Taormina also showed how Aeolus data improved models of Mount Etna’s ash plume as it travelled across Greece in March 2021.

The effect is important to warn the airline industry of potential hazards, as encounters with ash clouds in high concentrations can reduce visibility and damage aircraft engines.

Aeolus Third Anniversary Conference

The future is bright for Doppler wind lidars in space

While Aeolus is set for at least another year, discussions in Taormina inevitably led to potential follow-on missions. “The value of Aeolus is not only scientific, but also economic and societal,” said ESA’s Director of Earth Observation Programmes Simonetta Cheli in her opening address in Taormina. “Following the success of Aeolus and the operational assimilation of data into weather forecast models, it’s clear there is growing support for a follow-on mission.”

Related links:

Aeolus: https://www.esa.int/Applications/Observing_the_Earth/FutureEO/Aeolus

FutureEO: https://www.esa.int/Applications/Observing_the_Earth/FutureEO

Observing the Earth: https://www.esa.int/Applications/Observing_the_Earth

Images, Video, Text, Credits: ESA/ECMWF–M. Rennie/ATG medialab.

Best regards, Orbiter.ch

Greenland Ice, Jupiter Moon Share Similar Feature

 







NASA - Europa Clipper Mission patch.


April 26, 2022

Parallel ice ridges, a common feature on Jupiter’s moon Europa, are found on Greenland’s ice sheet – and could bode well for Europa’s potential habitability.


Image above: The surface geology of Jupiter’s icy moon Europa is on display in this view made from images taken by NASA’s Galileo spacecraft in the late 1990s. Image Credits: NASA/JPL-Caltech/SETI Institute.

Parallel ice ridges in Greenland bear a striking resemblance to ridges on Jupiter’s ice-encased moon Europa, suggesting the moon’s icy shell could be riddled with pockets of water.

This similarity could greatly improve the odds of NASA’s Europa Clipper mission detecting potentially habitable environments on the Jovian moon. The spacecraft’s ice-penetrating radar instrument REASON (short for Radar for Europa Assessment and Sounding: Ocean to Near-surface) will be ideal for conducting such a search.

“If there are pockets of water under the ridges, we have the right instruments to see them,” said Dustin Schroeder, a Stanford University associate professor and coauthor of a new study comparing Greenland’s “double ridges” with those of Europa.

Scientists say evidence gathered so far shows that Europa harbors a deep liquid ocean, hidden beneath an ice shell that could be 10 to 15 miles (15 to 25 kilometers) thick. Because the ice is so substantial, a big question about the moon is whether anything from the deep ocean makes contact with the surface – or if contact goes the other way, with surface material filtering down to the ocean water.

“It’s exciting, what it would mean if you have plenty of water within the ice shell,” said coauthor Gregor Steinbrügge, a former Stanford researcher who is now a planetary scientist at NASA’s Jet Propulsion Laboratory in Southern California. “It would mean the ice shell on Europa is extremely dynamic. It could facilitate exchange processes between the surface and the subsurface ocean. It could go in both directions.”

Potential life-sustaining nutrients on Europa’s surface – perhaps deposited there by another Jupiter moon, volcanic Io – might find their way to the subsurface ocean, he said. And chemicals or other material from the subsurface indicating a habitable ocean environment could end up on the surface.

How Ridges May Have Formed

During a presentation on Europa’s ridges, the study’s lead author, Stanford graduate student Riley Culberg, said he noticed similar landforms in Greenland. Ice-penetrating radar data collected from 2015 to 2017 by NASA’s Operation IceBridge, an aerial observation campaign, showed not only the existence of a double ridge in northwestern Greenland, but also details of how it evolved.

The double ridges observed on the surface of the Greenland Ice Sheet formed when water from nearby surface lakes drained into a layer of impermeable ice within the ice sheet. Once there, the water pocket refroze and fractured the overlying ice, forcing peaks to rise on either side.

Something similar could be happening on Europa, but instead with water forced up toward the surface from the subsurface ocean. The ridge features on Europa, while similar to the Greenland ridges, are much larger and with taller peaks, perhaps due in part to lower gravity on Europa.


Image above: A double ridge cutting across the surface of Europa is seen in this mosaic of two images taken by NASA’s Galileo during the spacecraft’s close flyby on Feb. 20, 1997. Analysis of a similar feature in Greenland suggests shallow liquid water may be ubiquitous across the Jovian moon’s icy shell. Image Credits: NASA/JPL/ASU.

Europa Clipper’s REASON instrument is designed to make the same kind of measurements at Europa that the IceBridge radar made in Greenland. Both use radio waves that can penetrate deeply into ice. The same waves, however, cannot penetrate liquid water and are instead reflected back to the radar instrument. Water shows up as a bright patch in the radar images. These radargrams can therefore provide a vertical profile of water and ice deep below the surface.

“You get reflections that are a thousand times brighter for water as opposed to ice,” Schroeder said.

Schroeder, a co-investigator on REASON and part of a group that studies Europa’s interior, said the new study could help the Europa Clipper team design observations to determine whether the ridges on the moon and in Greenland arose from the same underlying causes – and whether water pockets are common within Europa’s icy shell.

The study also highlights the growing synergy between scientists who study our planetary neighbors in the solar system and those who focus on Earth.

“This research will help us either use Earth to understand what we will see on Europa or, when we get to Europa, help us interpret what we see when we get there,” Schroeder said.

More About the Mission

Missions such as Europa Clipper contribute to the field of astrobiology, the interdisciplinary research on the variables and conditions of distant worlds that could harbor life as we know it. While Europa Clipper is not a life-detection mission, it will conduct detailed reconnaissance of Europa and investigate whether the icy moon, with its subsurface ocean, has the capability to support life. Understanding Europa’s habitability will help scientists better understand how life developed on Earth and the potential for finding life beyond our planet.

Europa Clipper. Image Credits: NASA/JPL-Caltech

Managed by Caltech in Pasadena, California, JPL leads the development of the Europa Clipper mission in partnership with APL for NASA’s Science Mission Directorate in Washington. The Planetary Missions Program Office at NASA’s Marshall Space Flight Center in Huntsville, Alabama, executes program management of the Europa Clipper mission.

Related links:

Stanford University new study: https://www.nature.com/articles/s41467-022-29458-3

Europa Clipper: https://europa.nasa.gov/

Radar for Europa Assessment and Sounding: Ocean to Near-surface (REASON): https://europa.nasa.gov/spacecraft/instruments/reason/

NASA’s Operation IceBridge: https://www.nasa.gov/mission_pages/icebridge/index.html

Images (mentioned), Text, Credits: NASA/JPL/Gretchen McCartney/Written by Pat Brennan.

Greetings, Orbiter.ch