The 6,200-mile-long structure was observed by Japan's Akatsuki spacecraft and is believed to be created by mountains on the surface of Venus.
The NASA astronaut commanded Apollo 17 in 1972, logging more than 73 hours of extravehicular activity on the lunar surface.
NASA's New Horizons mission has revealed, for the first time, evidence of ice features known as "penitentes" beyond Earth.
Elon Musk's private spaceflight company also nailed its first California ocean rocket landing minutes after sending the payload into space.
New dynamical simulations suggest that the mysterious unseen world might be an interstellar rogue that was captured by our solar system.
Grounded since a September explosion, Elon Musk's private spaceflight company is aiming to launch 10 communications satellites into orbit from California on Saturday morning.
Since November, European Space Agency astronaut Thomas Pesquet has been taking photographs of Earth from the International Space Station, and the results have captivated the world.
The B612 Foundation reacts to NASA's decision not to fully fund a hazardous asteroid-hunting mission, urging the next administration to pick an infrared space telescope that would seek out near-Earth asteroid threats.