Roughly 4.5 billion years ago, the young solar system was a swirling cloud of gas and dust that formed the first asteroids and planets, including the young Earth, then a hot, molten sphere likely ...

Astronomers are watching a new comet pass through our solar system with great interest. Based on its glow, the 33-billion-ton ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

Millions of years before blue oceans and wandering continents, the Earth in its early days was a molten, tumultuous planet — ...

NASA's Artemis program is set to explore the Moon's south pole, a region of perpetual darkness holding clues to the solar ...

A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar system by more than 3 billion years, researchers say. The "water ice-rich" ...

Recent sightings of interstellar comet 3I/ATLAS have sparked discussions of Jewish hopes and fears about extraterrestrial ...

A groundbreaking study of asteroid Ryugu has revealed something scientists never expected: water moved through its rocky ...

MIT scientists have discovered ancient rock samples from Greenland, Canada, and Hawaii exhibiting a rare potassium-40 deficit ...

In 2006, updated research led to Pluto being controversially demoted to dwarf planet status by the International Astronomical Union. The reasoning was that Pluto's location in the far-flung ...