Massive asteroid as wide as 8 football fields skims past Earth today

Earth's atmosphere may be source of some lunar water

Jupiter's moon Io (which is about 0.28 Earths wide) has around 400 volcanoes, and over 130 are erupting at any given time. Only around 50 volcanoes erupt on Earth each YEAR.

'Potentially hazardous' asteroid twice the size of the Empire State Building will skim past Earth Thursday, NASA says