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 is a redshift?" (Ask an Astronomer)

Ask an Astronomer Video • May 24th, 2006 • ask2006-001

'Ask an Astronomer' uses an astronomer, a flying saucer, and a cow to help explain this difficult astronomical concept in simple terms.