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Blob
2006-Jun-05, 04:46 PM
Dr. Pauline Barmby of the Harvard-Smithsonian Center for Astrophysics, Cambridge and her colleagues recently observed the Andromeda galaxy using the Spitzer space telescope.

Barmby and her team used the Spitzer data to make drastically improved measurements of Andromeda's infrared brightness. They found that the galaxy shines with the same amount of energy as about 4 billion suns. Based on these measurements, the astronomers confirmed that there are roughly 1 trillion stars in the galaxy. Our Milky Way galaxy is estimated to house a couple of hundred billion stars.

Source (http://www.jpl.nasa.gov/news/news.cfm?release=2006-082)