Anyone with a telescope, and perhaps even a pair of binoculars or a large camera lens, may want to be looking at the moon Saturday night:

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).

That is, as long as it's all clear anyway. Nobody knows if it will be bright enough to see from here, but it's worth a shot.