Shorty after 4 p.m. ET today (June 27), the mountain-size asteroid 2011 UL21 will come within 5 million miles of Earth, making it one of the largest space rocks to come that close to our planet for ...

Brussels, Belgium - March 15, 2011: With just over 11 days to go before hundreds of millions of people come together for Earth Hour, high profile individuals from across the globe are leading the way ...

For just under an hour, the disk of the full moon almost disappeared. Dec. 10, 2011— -- Those in the right place at the right time this morning enjoyed a special viewing -- the last lunar eclipse ...

"At any given time, there should be at least one natural Earth satellite of 1-meter diameter orbiting the Earth," say Granvik and co. These objects should hang around for about 10 months and make ...