The fear, of course, is that one will go undiscovered in the sky until it's too late and then hit the Earth. While the actual ...

is that one will go undiscovered in the sky until it's too late and then hit the Earth. While the actual risk is incredibly small, Hemmelgarn said, the impact of even a small comet could be ...

Designated as COWECP5, the asteroid burned up in the atmosphere as it streaked across the Eastern Siberia sky around 11:14 ...

"It also has to have an absolute brightness of 22.0 or less (lower values of the magnitude are brighter = larger objects), i.e. an asteroid (or comet) that would cause significant regional damage if ...

An asteroid was pegged to hit Earth “imminently,” according to ... What’s the difference between an asteroid and a comet? An asteroid is a small, inactive body that orbits the sun, typically ...

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 possibility ...