Humans have questions about alien life. But those beings, if they exist, likely have some questions of their own about humans, queries we may want to answer before we find any life beyond Earth.
Scientists studying Mars have wanted pieces of the Red Planet here on Earth for decades, and they are finally getting their shot at designing a mission to acquire such souvenirs.
How long until we find evidence of life beyond Earth? If a panel of experts is on track with their estimates, it may be sooner than you think.
Israel had pinned its hopes on becoming the fourth country to land softly on the moon, and although the country's team failed on the first try, it still intends to try to claim that coveted title.
Observations of the interstellar Comet Borisov have been flooding in for six weeks, and the more astronomers duplicate one another's work, the more confident they are in their analysis of the object.
The Nobel Prize in physics this year has gone to two very different research threads — and danced around some big societal issues, even as they celebrate distinguished work.
It looks like just a barren moonscape of craters, but somewhere in this image is a hunk of metal and electronics that carried a country's hopes of lunar science.
The best view of today's crew launch turned out to be from the spacecraft's destination itself, the International Space Station.
A bright speck in the night sky may be the second known object to hurtle through our solar system after leaving another.
India's daring moon mission, Chandrayaan-2, lost contact just above the lunar surface, dashing Indian dreams of becoming just the fourth country to successfully land on the moon.
Hurricane Dorian's clouds are staggering, a massive swirl of white surrounding the knotted eyewall at the storm's heart, in this image taken from space.
Hurricane Dorian is terrifying even from the International Space Station, where astronaut Luca Parmitano captured photos of the Category 5 storm.
Astronomers have been watching the black hole at the center of our galaxy for 20 years, and in May, they saw something they'd never seen before.
A team of four NASA spacecraft finally caught sight of a phenomenon scientists have been hunting for years: an interplanetary shock.
This is one of the most tangible pieces of evidence yet for the idea that explosive volcanism was more common on early Mars.
A space rock called Bennu is getting its close-up: NASA's OSIRIS-REx mission to explore the asteroid has entered a new phase of detailed survey work.
It's still unclear how the dramatic operation went. But the hope is the explosive-packed bomb cut an artificial crater into Ryugu.
On a distant space rock being explored by a NASA probe, days are slowly shortening — and scientists are still trying to figure out why.