CAPE CANAVERAL, Fla. – A pair of NASA astronauts ventured out on their second spacewalk in under a week Monday to complete a four-year effort to modernize the International Space Station’s power grid.
Over the weekend, flight controllers in Houston used the station’s big robot arm to replace the last pair of old-style batteries with a single better-quality one. Astronauts Mike Hopkins and Victor Glover needed to put the finishing touches on this newest lithium-ion battery to complete a series of spacewalks that began in 2017.
“Beautiful day. Let’s go for a walk outside,” Mission Control radioed as the spacewalk got off to a late start.
The space station is now equipped with 24 lithium-ion batteries to store power collected by the solar panels. The big, boxy batteries, surpassing 400 pounds (180 kilograms) each, provide electricity for the orbiting lab when it’s on the night side of Earth. They’re so powerful that only half as many are needed as the old nickel-hydrogen batteries they replaced.
The upgrade took longer than expected after one of the new batteries failed following its installation two years ago and had to be replaced. In all, 14 spacewalks were needed to complete the battery work.
NASA expects these batteries to last the rest of the space station’s operating life.
Other spacewalking chores Monday for Hopkins and Glover include installing a new camera on the U.S. Destiny lab and replacing parts in the camera system outside the station’s Japanese lab, named Kibo, or Hope in English.
During a spacewalk on Wednesday, the two astronauts made improvements to the European lab, Columbus.
Two more spacewalks will be conducted in about a month to get ready for additional solar panels set for delivery later this year.
Seven astronauts currently live on the space station: four Americans, two Russians and one Japanese.
Source: – Toronto Star
See Astronaut's Sublime Shot of Total Lunar Eclipse Snapped From the ISS – CNET
Earthlings on Earth weren’t the only ones whothe lovely blushing of the “flower blood moon” total lunar eclipse on Sunday night and Monday morning. Residents of the International Space Station had a great view of the spectacular celestial event.
European Space Agency astronaut Samantha Cristoforetti shared a beautiful series of photos of the eclipse as seen from orbit. “A partially eclipsed moon playing hide-and-seek with our solar panel,” Cristoforetti tweeted on Monday.
The photos show the eclipse in progress, with the moon peeking under the station’s solar panels. One stunning view also shows Earth below, clouds visible against an expanse of blue. The images highlight the subtle shading of the moon as our planet threw its shadow across it.
Cristoforetti shared another look with just the eclipsed moon peeking over the curve of Earth.
Cristoforetti is an accomplished space photographer, having snapped plenty of gorgeous images during her last stay on the ISS in 2014 and 2015. Her most recent stint started in late April as part of launched by SpaceX.
I watched the eclipse last night from New Mexico. As the shadow moved across the moon, the ISS flew over, a bright bead of light crossing against the starry sky. So as I was seeing the ISS, Cristoforetti was likely tracking the eclipse, too. It doesn’t matter whether you’re on the ground or up in orbit,.
NASA's InSight still hunting marsquakes as power levels diminish – Phys.org
Dusty solar panels and darker skies are expected to bring the Mars lander mission to a close around the end of this year.
NASA’s InSight Mars lander is gradually losing power and is anticipated to end science operations later this summer. By December, InSight’s team expects the lander to have become inoperative, concluding a mission that has thus far detected more than 1,300 marsquakes—most recently, a magnitude 5 that occurred on May 4—and located quake-prone regions of the Red Planet.
The information gathered from those quakes has allowed scientists to measure the depth and composition of Mars’ crust, mantle, and core. Additionally, InSight (short for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) has recorded invaluable weather data and studied remnants of Mars’ ancient magnetic field.
“InSight has transformed our understanding of the interiors of rocky planets and set the stage for future missions,” said Lori Glaze, director of NASA’s Planetary Science Division. “We can apply what we’ve learned about Mars’ inner structure to Earth, the Moon, Venus, and even rocky planets in other solar systems.”
InSight landed on Mars Nov. 26, 2018. Equipped with a pair of solar panels that each measures about 7 feet (2.2 meters) wide, it was designed to accomplish the mission’s primary science goals in its first Mars year (nearly two Earth years). Having achieved them, the spacecraft is now into an extended mission, and its solar panels have been producing less power as they continue to accumulate dust.
Because of the reduced power, the team will soon put the lander’s robotic arm in its resting position (called the “retirement pose”) for the last time later this month. Originally intended to deploy the seismometer and the lander’s heat probe, the arm has played an unexpected role in the mission: Along with using it to help bury the heat probe after sticky Martian soil presented the probe with challenges, the team used the arm in an innovative way to remove dust from the solar panels. As a result, the seismometer was able to operate more often than it would have otherwise, leading to new discoveries.
When InSight landed, the solar panels produced around 5,000 watt-hours each Martian day, or sol—enough to power an electric oven for an hour and 40 minutes. Now, they’re producing roughly 500 watt-hours per sol—enough to power the same electric oven for just 10 minutes.
Additionally, seasonal changes are beginning in Elysium Planitia, InSight’s location on Mars. Over the next few months, there will be more dust in the air, reducing sunlight—and the lander’s energy. While past efforts removed some dust, the mission would need a more powerful dust-cleaning event, such as a “dust devil” (a passing whirlwind), to reverse the current trend.
“We’ve been hoping for a dust cleaning like we saw happen several times to the Spirit and Opportunity rovers,” said Bruce Banerdt, InSight’s principal investigator at NASA’s Jet Propulsion Laboratory in Southern California, which leads the mission. “That’s still possible, but energy is low enough that our focus is making the most of the science we can still collect.”
If just 25% of InSight’s panels were swept clean by the wind, the lander would gain about 1,000 watt-hours per sol—enough to continue collecting science. However, at the current rate power is declining, InSight’s non-seismic instruments will rarely be turned on after the end of May.
Energy is being prioritized for the lander’s seismometer, which will operate at select times of day, such as at night, when winds are low and marsquakes are easier for the seismometer to “hear.” The seismometer itself is expected to be off by the end of summer, concluding the science phase of the mission.
At that point, the lander will still have enough power to operate, taking the occasional picture and communicating with Earth. But the team expects that around December, power will be low enough that one day InSight will simply stop responding.
Jet Propulsion Laboratory
NASA’s InSight still hunting marsquakes as power levels diminish (2022, May 17)
retrieved 18 May 2022
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On the evening of May 15, 2022, Earth passed between the Sun and the Moon blocking sunlight and casting a shadow on the lunar surface. ESA astronaut Samantha Cristoforetti witnessed this lunar eclipse from the International Space Station and captured it in a series of photographs.
During a lunar eclipse, Earth’s atmosphere scatters sunlight. The blue light from the Sun scatters away, and longer-wavelength red, orange, and yellow light pass through, turning our Moon red.
In these images, the Moon appears to play hide and seek with one of the International Space Station’s solar panels:
Samantha is living and working aboard the Space Station for her second mission, ‘Minerva’. Learn more about Samantha and the Minerva mission.
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