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 ...

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 ...

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 ...

The Space Weather Prediction Center has issued a strong geomagnetic storm watch, level G3 out of 5, for Dec. 31.

A black moon will be in the sky on Dec. 30 at 5:27 p.m., according to the United States Navy's Astronomical Applications ...

Where do Earth's oceans come from? The debate on whether water may have been originally delivered to our planet by comets striking its surface has reopened after a new groundbreaking study.