Dark energy is even more mysterious than astronomers had thought, a new study suggests.
One of the Hubble Space Telescope's most famous images peered even deeper into the cosmos than scientists had thought.
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.
The weirdly clustered orbits of some far-flung bodies in our solar system can be explained without invoking a big, undiscovered "Planet Nine," a new study suggests.
A spectacular new video gives a lander's-eye view of the first-ever touchdown on the moon's mysterious far side.
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.
Ultima Thule, the weird Kuiper Belt object that NASA's New Horizons spacecraft visited in a historic flyby on Jan. 1, 2019, looks like a cosmic bowling pin, scientists say.
NASA's OSIRIS-REx probe, which just arrived at the asteroid Bennu last week, has already found lots of hydrated minerals on the space rock, mission team members announced today (Dec. 10).
China's robotic Chang'e 4 spacecraft launched from Xichang Satellite Launch Center Dec. 7, kicking off the first-ever surface mission to the moon's far side.
SpaceX's next cargo launch to the International Space Station has been pushed back to Wednesday (Dec. 5) due to a rodent problem.
NASA's OSIRIS-REx probe sidled up to the diamond-shaped asteroid Bennu today (Dec. 3), bringing an end to a circuitous deep-space chase that lasted 27 months.
NASA's InSight lander touched down safely on the Martian surface today (Nov. 26), pulling off the first successful Red Planet landing since the Curiosity rover's arrival in August 2012.
A NASA scientist actually spotted two sharp-cornered icebergs during a recent research flight over Antarctica.
The Chandra X-ray Observatory, which has been observing the universe in high-energy light since 1999, entered a protective "safe mode" on Wednesday (Oct. 10).
Scientists have discovered another marker on the trail toward the putative Planet Nine — an extremely distant dwarf planet called 2015 TG387, and nicknamed 'The Goblin.'