Monday, October 26, 2009

I wonder just how many galaxies we have discovered
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1 comment:

  1. TinaOctober 26, 2009 at 7:04 PM

    Astronomers think that there are hundreds of billions galaxies in the universe, however the exact number is not known.

    In just one image for example, the Hubble Ultra Deep Field, above, there are about 10,000 galaxies visible.

    In our own galaxy, There are between 100-300 billion stars in the Milky Way. At most, 8,479 of them are visible from Earth. Roughly 2,500 stars are available to the unaided eye in ideal conditions from a single spot at a given time.

    But the number of galaxies will keep growing as our telescopes get better and can look out and back farther in time.

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