We have launched the new Spitzer website! Send feedback to outreach@ipac.caltech.edu. Find the old website at http://legacy.spitzer.caltech.edu.

What's Between the Stars? (Ask an Astronomer)

Ask an Astronomer Video • October 23rd, 2008 • ask2008-006

In this 'Ask an Astronomer' episode, Dr. Michelle Thaller explains how there can be an interstellar medium in a vacuum.