Apod 1.2
This is a picture of the star cluster Pleiades, also known as "The Seven Sisters" and M45. The blue swirls surrounding some of the stars are "blue reflection nebulae". It is one of the brightest and closest open star clusters. The Pleiades contains more than 3,000 stars and is almost 4,000 light years away, but it is only 13 light years across. Brown dwarfs can also be found inside this cluster.
It is hard to imagine that there are 3,000 stars in this picture alone. It reminds me of a similar picture with 3,000 visible: http://apod.nasa.gov/apod/image/1207/orion_hubble_6000.jpg
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