Astronomers discovered a new moon of Uranus and hundreds of moons around Saturn over the past year, and there may be many ...

From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

The newly identified cluster of Kuiper Belt objects lies about 4 billion miles from the Sun, offering fresh clues about how ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

A colossal Martian volcano defies everything we know about planetary geology. Hidden clues beneath its frozen summit hint at ...

How did life begin on Earth? While scientists have theories, they don’t yet fully understand the precise chemical steps that ...

A surprising new theory claims Earth’s building blocks were supernova ice, not stardust. This could change everything.

Solar sails have some major advantages over traditional propulsion methods—most notably, they don't use any propellant. But, ...

From new exoplanetary neighbors and a weakening dark energy to the best evidence for life on Mars and an interstellar comet ...

With sapphire waterfalls, lava rain and orbits around dead stars, these distant worlds push the limits of what’s possible.

A disk 40 times the diameter of our solar system has been discovered by the Hubble Telescope, which is likely an image of ...