NASA’s Europa Clipper Survives and Thrives in ‘Outer Space’ on Earth

NASA’s Europa Clipper Survives and Thrives in ‘Outer Space’ on Earth

5 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

Europa Clipper is seen in the 85-Foot Space Simulator at JPL
Europa Clipper is seen in the 25-Foot Space Simulator at JPL in February, before the start of thermal vacuum testing. A battery of tests ensures that the NASA spacecraft can withstand the extreme hot, cold, and airless environment of space.
NASA/JPL-Caltech

A gantlet of tests prepared the spacecraft for its challenging trip to the Jupiter system, where it will explore the icy moon Europa and its subsurface ocean.

In less than six months, NASA is set to launch Europa Clipper on a 1.6-billion-mile (2.6-billion-kilometer) voyage to Jupiter’s ocean moon Europa. From the wild vibrations of the rocket ride to the intense heat and cold of space to the punishing radiation of Jupiter, it will be a journey of extremes. The spacecraft was recently put through a series of hard-core tests at the agency’s Jet Propulsion Laboratory in Southern California to ensure it’s up to the challenge.

Called environmental testing, the battery of trials simulates the environment that the spacecraft will face, subjecting it to shaking, chilling, airlessness, electromagnetic fields, and more.

“These were the last big tests to find any flaws,” said JPL’s Jordan Evans, the mission’s project manager. “Our engineers executed a well-designed and challenging set of tests that put the system through its paces. What we found is that the spacecraft can handle the environments that it will see during and after launch. The system performed very well and operates as expected.”

The Gantlet

The most recent environmental test for Europa Clipper was also one of the most elaborate, requiring 16 days to complete. The spacecraft is the largest NASA has ever built for a planetary mission and one of the largest ever to squeeze into JPL’s historic 85-foot-tall, 25-foot-wide (26-meter-by-8-meter) thermal vacuum chamber (TVAC). Known as the 25-foot Space Simulator, the chamber creates a near-perfect vacuum inside to mimic the airless environment of space.

At the same time, engineers subjected the hardware to the high temperatures it will experience on the side of Europa Clipper that faces the Sun while the spacecraft is close to Earth. Beams from powerful lamps at the base of the Space Simulator bounced off a massive mirror at its top to mimic the heat the spacecraft will endure.

To simulate the journey away from the Sun, the lamps were dimmed and liquid nitrogen filled tubes in the chamber walls to chill them to temperatures replicating space. The team then gauged whether the spacecraft could warm itself, monitoring it with about 500 temperature sensors, each of which had been attached by hand.

Watch as engineers and technicians move NASA’s Europa Clipper into the thermal vacuum chamber at JPL in February 2024.
Credit: NASA/JPL-Caltech

TVAC marked the culmination of environmental testing, which included a regimen of tests to ensure the electrical and magnetic components that make up the spacecraft don’t interfere with one another.

The orbiter also underwent vibration, shock, and acoustics testing. During vibration testing, the spacecraft was shaken repeatedly – up and down and side to side – the same way it will be jostled aboard the SpaceX Falcon Heavy rocket during liftoff. Shock testing involved pyrotechnics to mimic the explosive jolt the spacecraft will get when it separates from the rocket to fly its mission. Finally, acoustic testing ensured that Europa Clipper can withstand the noise of launch, when the rumbling of the rocket is so loud it can damage the spacecraft if it’s not sturdy enough.

“There still is work to be done, but we’re on track for an on-time launch,” Evans said. “And the fact that this testing was so successful is a huge positive and helps us rest more easily.”

Looking to Launch

Later this spring, the spacecraft will be shipped to NASA’s Kennedy Space Center in Florida. There, teams of engineers and technicians will carry out final preparations with eyes on the clock. Europa Clipper’s launch period opens Oct. 10.

After liftoff, the spacecraft will zip toward Mars, and in late February 2025, it will be close enough to use the Red Planet’s gravitational force for added momentum. From there, the solar-powered spacecraft will swing back toward Earth to get another slingshot boost – from our own planet’s gravitational field – in December 2026.

Then it’s on to the outer solar system, where Europa Clipper is set to arrive at Jupiter in 2030. The spacecraft will orbit the gas giant while it flies by Europa 49 times, dipping as close as 16 miles (25 kilometers) from the moon’s surface to gather data with its powerful suite of science instruments. The information gathered will tell scientists more about the moon’s watery interior.

More About the Mission

Europa Clipper’s main science goal is to determine whether there are places below the surface of Jupiter’s icy moon, Europa, that could support life. The mission’s three main science objectives are to determine the thickness of the moon’s icy shell and its surface interactions with the ocean below, to investigate its composition, and to characterize its geology. The mission’s detailed exploration of Europa will help scientists better understand the astrobiological potential for habitable worlds beyond our planet.

Managed by Caltech in Pasadena, California, JPL leads the development of the Europa Clipper mission in partnership with the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, for NASA’s Science Mission Directorate in Washington. APL designed the main spacecraft body in collaboration with JPL and NASA’s Goddard Space Flight Center in Greenbelt, Maryland. The Planetary Missions Program Office at NASA’s Marshall Space Flight Center in Huntsville, Alabama, executes program management of the Europa Clipper mission.

Find more information about Europa here:

europa.nasa.gov

News Media Contacts

Gretchen McCartney
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-6215
gretchen.p.mccartney@jpl.nasa.gov

Karen Fox / Charles Blue
NASA Headquarters, Washington
301-286-6284 / 202-802-5345
karen.c.fox@nasa.gov / charles.e.blue@nasa.gov

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Anthony Greicius

ESA, NASA Solar Observatory Discovers Its 5,000th Comet

ESA, NASA Solar Observatory Discovers Its 5,000th Comet

4 min read

ESA, NASA Solar Observatory Discovers Its 5,000th Comet

On March 25, 2024, a citizen scientist in the Czech Republic spotted a comet in an image from the Solar and Heliospheric Observatory (SOHO) spacecraft, which has now been confirmed to be the 5,000th comet discovered using SOHO data. SOHO has achieved this milestone over 28 years in space, even though it was never designed to be a comet hunter.

An image from the SOHO spacecraft shows the Sun covered by a red disk. A white circle within that disk shows the size of the Sun. Around the disk, white and orange streamers in the solar corona extend away from the Sun. In the upper left, a small white box opens up into a larger white box that has “SOHO-5000” written above a faint dot with one short, vertical white line above it and another below it. At the bottom is written “2024/03/25 03:48” and “ESA/NASA SOHO/LASCO C2.”
The 5,000th comet discovered with the Solar and Heliospheric Observatory (SOHO) spacecraft is noted by a small white box in the upper left portion of this image. A zoomed-in inset shows the comet as a faint dot between the white vertical lines. The image was taken on March 25, 2024, by SOHO’s Large Angle and Spectrometric Coronagraph (LASCO), which uses a disk to block the bright Sun and reveal faint features around it.
NASA/ESA/SOHO

The comet is a small body made of ice and rock that takes only a few years to orbit the Sun. It belongs to the “Marsden group” of comets. This group is thought to be related to comet 96P/Machholz (which SOHO observes when Machholz passes near the Sun every 5.3 years) and is named for the late scientist Brian Marsden who first recognized the group using SOHO observations. Only about 75 of the 5,000 comets discovered with SOHO belong to the Marsden group.

A joint mission of ESA (European Space Agency) and NASA, SOHO launched in December 1995 to study the Sun and the dynamics in its outer atmosphere, called the corona. A science instrument on SOHO, called the Large Angle and Spectrometric Coronagraph (LASCO), uses an artificial disk to block the blinding light of the Sun so scientists can study the corona and environment immediately around the Sun.

This also allows SOHO to do something many other spacecraft cannot – see comets flying close to the Sun, known as “sungrazing” comets or “sungrazers.” Many of these comets only brighten when they’re too close to the Sun for other observatories to see and would otherwise go undetected, lost in the bright glare of our star. While scientists expected SOHO to serendipitously find some comets during its mission, the spacecraft’s ability to spot them has made it the most prolific comet-finder in history – discovering more than half of the comets known today.

In fact, soon after SOHO launched, people around the world began spotting so many comets in its images that mission scientists needed a way to keep track of them all. In the early 2000s, they launched the NASA-funded Sungrazer Project that allows anyone to report comets they find in SOHO images.

This animation shows the Solar and Heliospheric Observatory’s 5,000th comet (circled) moving across the field relative to background stars. The images in this sequence were taken with the spacecraft’s Large Angle and Spectrometric Coronagraph (LASCO) instrument.
NASA/ESA/SOHO

SOHO’s 5,000th comet was found by Hanjie Tan, a Sungrazer Project participant who is originally from Guangzhou, China, and is currently pursuing a doctoral degree in astronomy in Prague, Czech Republic. Tan has been participating in the Sungrazer Project since he was 13 years old and is one of the project’s youngest comet discoverers.

“Since 2009, I’ve discovered over 200 comets,” Tan said. “I got into the Sungrazer Project because I love looking for comets. It’s really exciting to be the first to see comets get bright near the Sun after they’ve been traveling through space for thousands of years.”

Most of the 5,000 comets discovered using SOHO have been found with the help of an international cadre of volunteer comet hunters – many with no formal scientific training – participating in the Sungrazer Project.

“Prior to the launch of the SOHO mission and the Sungrazer Project, there were only a couple dozen sungrazing comets on record – that’s all we knew existed,” said Karl Battams, a space scientist at the U.S. Naval Research Lab in Washington, D.C., and the principal investigator for the Sungrazer Project. “The fact that we’ve finally reached this milestone – 5,000 comets – is just unbelievable to me.”

SOHO’s 5,000th comet was discovered with the help of volunteers participating in the NASA-funded Sungrazer Project.
Credit: NASA’s Goddard Space Flight Center

The vast number of comets discovered using SOHO has allowed scientists to learn more about sungrazing comets and groups of comets that orbit the Sun. Comets discovered by the Sungrazer Project have also helped scientists learn more about the Sun, by watching the comets plunge through our star’s atmosphere like small solar probes.

“The statistics of 5,000 comets, and looking at their orbits and trajectories through space, is a super unique dataset – it’s really valuable science,” Battams said. “It’s a testament to the countless hours the project participants have put into this. We absolutely would never had reached this milestone if it wasn’t for what the project volunteers have done.”

The Sungrazer Project is one of many opportunities that anyone can get involved with to help make discoveries with NASA during the Heliophysics Big Year, which extends through the end of 2024. Learn more about SOHO, the Sungrazer Project, and other NASA science projects you can participate in:

by Vanessa Thomas
NASA’s Goddard Space Flight Center, Greenbelt, Md.

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IXPE Operations Update

IXPE Operations Update

1 min read

IXPE Operations Update

Artist Rendering of IXPE in Space

On March 23, NASA’s IXPE (Imaging X-ray Polarimetry Explorer) stopped transmitting valid telemetry data. The only previous interruption of IXPE science observations was due to a similar issue in June of 2023.

On March 26, using procedures developed following that previous interruption, the team initiated a spacecraft avionics reset to address the issue, which put IXPE into a planned safe mode. The team has confirmed that IXPE is once again transmitting valid telemetry data and is now working to resume science operations, in as rapid and safe a manner as possible. The spacecraft is in good health.

Launched in 2021, IXPE is a space observatory built to discover the secrets of some of the most extreme cosmic objects – the remnants of supernova explosions, neutron stars, powerful particle streams ejected by feeding black holes, and more. The observatory is NASA’s first mission to study the polarization of X-rays from many different types of celestial objects. Follow the IXPE blog for further updates. 

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Mar 26, 2024

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NASA Selects First Lunar Instruments for Artemis Astronaut Deployment

NASA Selects First Lunar Instruments for Artemis Astronaut Deployment

Artist’s concept of an Artemis astronaut deploying an instrument on the lunar surface.
Credits: NASA

NASA has chosen the first science instruments designed for astronauts to deploy on the surface of the Moon during Artemis III. Once installed near the lunar South Pole, the three instruments will collect valuable scientific data about the lunar environment, the lunar interior, and how to sustain a long-duration human presence on the Moon, which will help prepare NASA to send astronauts to Mars.

“Artemis marks a bold new era of exploration, where human presence amplifies scientific discovery. With these innovative instruments stationed on the Moon’s surface, we’re embarking on a transformative journey that will kick-start the ability to conduct human-machine teaming – an entirely new way of doing science,” said NASA Deputy Administrator Pam Melroy. “These three deployed instruments were chosen to begin scientific investigations that will address key Moon to Mars science objectives.”

The instruments will address three Artemis science objectives: understanding planetary processes, understanding the character and origin of lunar polar volatiles, and investigating and mitigating exploration risks. They were specifically chosen because of their unique installation requirements that necessitate deployment by humans during moonwalks. All three payloads were selected for further development to fly on Artemis III that’s targeted to launch in 2026, however, final manifesting decisions about the mission will be determined at a later date. Members of these payload teams will become members of NASA’s Artemis III science team.

The Lunar Environment Monitoring Station (LEMS) is a compact, autonomous seismometer suite designed to carry out continuous, long-term monitoring of the seismic environment, namely ground motion from moonquakes, in the lunar south polar region. The instrument will characterize the regional structure of the Moon’s crust and mantle, which will add valuable information to lunar formation and evolution models. LEMS previously received four years of NASA’s Development and Advancement of Lunar Instrumentation funding for engineering development and risk reduction. It is intended to operate on the lunar surface from three months up to two years and may become a key station in a future global lunar geophysical network. LEMS is led by Dr. Mehdi Benna, from the University of Maryland, Baltimore County.

Lunar Effects on Agricultural Flora (LEAF) will investigate the lunar surface environment’s effects on space crops. LEAF will be the first experiment to observe plant photosynthesis, growth, and systemic stress responses in space-radiation and partial gravity.  Plant growth and development data, along with environmental parameters measured by LEAF, will help scientists understand the use of plants grown on the Moon for both human nutrition and life support on the Moon and beyond. LEAF is led by Christine Escobar of Space Lab Technologies, LLC, in Boulder, Colorado.

The Lunar Dielectric Analyzer (LDA) will measure the regolith’s ability to propagate an electric field, which is a key parameter in the search for lunar volatiles, especially ice. It will gather essential information about the structure of the Moon’s subsurface, monitor dielectric changes caused by the changing angle of the Sun as the Moon rotates, and look for possible frost formation or ice deposits. LDA, an internationally contributed payload, is led by Dr. Hideaki Miyamoto of the University of Tokyo and supported by JAXA (Japan Aerospace Exploration Agency).

“These three scientific instruments will be our first opportunity since Apollo to leverage the unique capabilities of human explorers to conduct transformative lunar science,” said Joel Kearns, deputy associate administrator for exploration in NASA’s Science Mission Directorate in Washington. “These payloads mark our first steps toward implementing the recommendations for the high-priority science outlined in the Artemis III Science Definition Team report.”

Artemis III, the first mission to return astronauts to the surface of the Moon in more than 50 years, will explore the south polar region of the Moon, within 6 degrees of latitude from the South Pole. Several proposed landing regions for the mission are located among some of the oldest parts of the Moon. Together with the permanently shadowed regions, they provide the opportunity to learn about the history of the Moon through previously unstudied lunar materials.

With the Artemis campaign, NASA will land the first woman, first person of color, and its first international partner astronaut on the Moon, and establish long-term exploration for scientific discovery and preparation for human missions to Mars for the benefit of all.

For more information on Artemis science, visit:

https://science.nasa.gov/lunar-science

-end-

Karen Fox / Erin Morton
Headquarters, Washington
202-358-1257 / 202-805-9393
karen.c.fox@nasa.gov / erin.morton@nasa.gov  

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Mar 26, 2024

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Tiernan P. Doyle

CADRE Rovers’ Test Drive in the Mars Yard

CADRE Rovers’ Test Drive in the Mars Yard

Two small rovers in a sandy yard. The rover in the back has solar panels fitted to it and white wheels. The one in the front has orange wheels and no solar panels.
NASA/JPL-Caltech

Two full-scale development model rovers, part of NASA’s Cooperative Autonomous Distributed Robotic Exploration (CADRE) technology demonstration, drive in the Mars Yard at the agency’s Jet Propulsion Laboratory in Southern California in this image from August 2023. The project is designed to show that a group of robotic spacecraft can work together as a team to accomplish tasks and record data autonomously – without explicit commands from mission controllers on Earth.

A series of Mars Yard tests with the development models confirmed CADRE hardware and software can work together to accomplish key goals for the project. The rovers drove together in formation and adjusted their plans as a group when faced with unexpected obstacles.

CADRE is slated to arrive at the Reiner Gamma region of the Moon through NASA’s Commercial Lunar Payload Services (CLPS) initiative. The network of robots will spend the daylight hours of a single lunar day – about 14 Earth days – conducting experiments that will test their capabilities.

Image Credit: NASA/JPL-Caltech

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Monika Luabeya