Amateur astronomers, grab your telescopes. A spaceship is about to crash into the Moon, and you may be able to see the impact. The spacecraft: SMART-1, a lunar orbiter belonging to the European Space Agency (ESA). The impact site: Lacus Excellentiae (The Lake of Excellence), an ancient, 100-mile wide crater in the Moon's southern hemisphere.
The time to watch: Saturday, September 2nd at 10:41 p.m. PDT (Sept. 3rd, 0541 UT).
But it can only be seen from the Americas.