EarthSky // FAQs // Space By EarthSky Jul 31, 2008

How do astronomers know how many stars there are in the Milky Way?

The estimate for the number of stars is about 100 billion stars – plus or minus 50 billion.

Many estimates in astronomy have some uncertainty to them, and the estimate of the number of stars in our galaxy is no exception. Even the world’s largest telescopes can’t count the stars. They see only the brightest and nearest stars – and stars not obscured by dust.

To estimate the number of the Milky Way’s stars, astronomers first assume there’s nothing special about our region of space. They determine the number of different types stars in this region – then extend this knowledge to the galaxy as a whole. The most popular current models suggest the Milky Way is about 100,000 light-years across. The estimate for the number of stars is about 100 billion stars – plus or minus 50 billion.

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2 Responses to How do astronomers know how many stars there are in the Milky Way?

  1. Sousou says:

    there should be more information then that…

  2. Kerr Robertson says:

    Science community should just start a computer count of the stars in the milkyway. Registat or a program that just scans the nights sky to count the stars would be helpful. I’v looked at so many web sites that just give a vague answer to the number and it makes me angry its the 21st century for crying outloud. Is astronomy still stuck in the stone age.

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