This year, Earth Hour was record breaking in many ways - with 135 countries and territories taking part; more iconic landmarks, cities, governments and people around the world than ever participated ...

A massive asteroid is set to make a close approach to Earth, raising concerns among scientists and space enthusiasts alike. The space rock, known as 2011 UL21 and about the size of Mount Everest, is ...

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 ...

Around the world, Earth Hour was embraced by the global community, transcending race, culture, age and economics as individuals took leadership in their communities in the pursuit of a cleaner and ...

A German X-ray telescope satellite is falling out of orbit, and this time, a lot of the craft could reach the Earth's surface intact. The Roentgen satellite could reenter Earth's atmosphere on Sunday, ...

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 ...

Every 6.6 years, the comet Giacobini-Zinner circulates through the inner solar system and passes through the perihelion, the closest point to the Sun of its orbit. Then, the comet sublimates the ices ...