The powerful Hubble Space Telescope was on hand to watch the collision between Deep Impact and Comet Tempel 1. Even though Hubble is one of the most sensitive telescopes available, the shroud of dust and gas surrounding Tempel 1 obscures a view of the comet’s nucleus. Hubble was able to see the flash from the impact, making the comet 4 times as bright, and then an expanding fan of debris moving away from the comet.