An official website of the United States government. Here's how you knowHere's how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Latest Earthquake | Chat Share
(top) Comet Shoemaker-Levy 9 imaged by the Hubble Space Telescope in 1994. (bottom) Hubble image of Jupiter after the Shoemaker-Levy 9 impacts, which left a row of dark splotches on the planet.