That acronym you learned to memorize the order of the planets has led you astray.
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On a distant space rock being explored by a NASA probe, days are slowly shortening — and scientists are still trying to figure out why.
SpaceX's famous "Starman" dummy onboard the inaugural Falcon Heavy launch is about to have some competition — from a new dummy, named Ripley, strapped into the company's first Crew Dragon capsule.
The best-ever photos of Ultima Thule have made it down to Earth, and they heighten the intrigue about the frigid and faraway world.
The final photos that NASA's New Horizons spacecraft snapped of Ultima Thule during the probe's epic Jan. 1 flyby reveal the distant object to be much flatter than scientists had thought.
A NASA scientist has visited a four-year-old island that satellites watched rise out of the waters — a rare opportunity to see in person a new island that lasts more than a few months.
Americans across the Midwest and Northeast can agree on one thing — it's really, really cold this week — and a NASA satellite monitoring air temperatures confirms the sentiment.
A chunk of material brought back from the moon by NASA astronauts in 1971 harbors a 4-billion-year-old piece of Earth that was blasted off our planet by a long-ago impact, a new study suggests.
Bacteria on the International Space Station are evolving and changing in the strange orbital environment. But they don't seem to be any more dangerous to humans.
The most distant celestial object ever explored may well have moons, and astronomers are trying hard to find them.
China's robotic Chang'e 4 mission touched down inside the huge South Pole-Aitken basin Wednesday (Jan. 2), pulling off the first-ever soft landing on the largely unexplored lunar far side.
Only moments before New Horizons flew by the most distant solar system object ever visited, astrophysicist and Queen guitarist Brian May released his new single based on the mission.