Spitzer's Fifth Anniversary
Description
This 'Ask an Astronomer' special looks at some of the biggest discoveries from NASA's Spitzer Space Telescope over the last five years.
Dr. Varoujan Gorjian explains the mind-boggling expansion of the Universe.
Published 08/26/09
Visit the W-5 star-forming region with 'Ask an Astronomer'!
Published 02/05/09