Peggy Whitson's comments come after Russia's space agency said it will stop delivering rocket engines to the US, following Western sanctions.
The James Webb telescope took over two decades and $10 billion to build. Difficult engineering and mismanagement led to overruns and delays for NASA.
Participants' names will be saved on a flash drive, which will fly around the moon aboard NASA's Orion capsule, as part of its Artemis 1 mission.
SpaceX plans to create a megaconstellation of over 42,000 Starlink satellites and released 46 more into outer space on Monday.
Galaxies merging together create starbursts and supermassive black hole collisions. The new James Webb Space Telescope is poised to study both.
The Tonga volcano shot a plume of ash 36 miles high, into the third layer of Earth's atmosphere. That's the biggest eruption captured by satellites.
NASA's Imaging X-ray Polarimetry Explorer (IXPE) will study black holes and exploded stars. Its first target is a powerful supernova.
Jared Isaacman announced on Monday that he plans to fly to outer space with SpaceX again, after participating in Inspiration4 last year.
SpaceX's Starship rocket is stacked atop its 23-story Super Heavy booster at the company's Boca Chica, Texas, facility. It has a few hurdles to clear.
NASA questioned SpaceX's claim that there's "zero risk" of a Starlink satellite colliding with large objects because each spacecraft can maneuver.
Saturn's aurora borealis, unlike auroras on other planets, is driven by a powerful weather system. The winds drag Saturn's magnetic field lines.
NASA and its international partners approved the astronaut crew for Axiom Space's first private mission to the ISS scheduled to launch in March.
NASA's Juno spacecraft and the Hubble Space Telescope helped researchers chart the electric currents driving Jupiter's aurora.
It's the second time a SpaceX Dragon parachute has failed to open as expected. NASA and SpaceX are investigating.
One of Saturn's smallest moons wasn't a candidate for alien life. But if Mimas has an ocean, it could point to a new class of "stealth" water worlds.
The asteroid, which is about a half-mile wide, has been studied by scientists for decades and will stay about 1.2 million miles away from Earth.
The US space agency fully deployed its James Webb Telescope, including a gold-plated hexagonal mirror, on Saturday for the first time.
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