Asteroid Impacts On Earth

Thursday, July 3rd, 2008 Posted in News, Planets, Space, Stuff | Comments Off

 A century ago this week, an event in far-off Siberia rang a cosmic wake-up call for Earth. That explosive event over remote Tunguska is generally viewed by scientists as a large space rock that pierced through the atmosphere of Siberia, ...

Volcanic Activity on Mercury

Thursday, July 3rd, 2008 Posted in News, Planets, Space, Stuff | Comments Off

In 1975, the Mariner 10 spacecraft returned intriguing images that showed smooth plains covering large swaths of Mercury's surface. But scientists could not determine whether the plains had been created by volcanic activity or by material ejected from below the ...