A group of comets with unexplained movements presents a quandary D avide Farnocchia hunts down and tracks asteroids, and ...

Water. All life on Earth requires it in some way or another, and it's hard to miss that roughly 70% of our planet's surface is covered in the stuff. Thus, understanding where Earth's water came ...

list=PLTiv_XWHnOZpvw5DLyh1xYARytUswtbJP For years, experts compared these ratios in comets and asteroids to the water found in Earth’s oceans. Jupiter-family comets, which likely formed beyond ...

New research indicates that the water on Comet 67P/Churyumov–Gerasimenko has a molecular signature closely matching that of water found in Earth’s oceans. This discovery revives the ...

The sample return capsule of the Stardust spacecraft was successfully recovered on January 15, 2006, and its cargo of coma grains from the Jupiter-family Comet Wild-2 has now been the subject of ...