Deep Impact (EPOXI) Stories

NASA’S Deep Impact Spacecraft Images Comet ISON

This frame from an animation series of images of comet C/2012 S1 (ISON) was taken by the Medium-Resolution Imager of NASA's Deep Impact spacecraft over a 36-hour period on Jan. 17 and 18, 2013.

The Same Here as There

New measurements from NASA's Herschel Space Observatory have discovered water with the same chemical signature as our oceans in a comet called Hartley 2 (pictured at right). The image at bottom right is an artist's concept of a comet.

Heavy and Light Just Right

Using NASA's Herschel Space Observatory, astronomers have discovered that comet Hartley 2 possesses a ratio of 'heavy water' to light, or normal, water that matches what's found in Earth's oceans.