Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Dsitribution of Stars and Galaxies?

  1. Mar 27, 2010 #1
    Ho :),
    I would like to know how exactly stars and galaxies are spread out throughout the universe.

    Are stars only found within galaxies?

    How many stars are without any planets?

    Whats the average number of planets in a star with planets?

    Whats the maximum/minimum number of planets with stars?

    Whats the galaxy:star ratio?

    Basically I would like to know everything required in order to create an artificial universe.

    Thanks :)




    If theres a good linke/document/book on this thatd be great.
  2. jcsd
  3. Mar 28, 2010 #2


    User Avatar
    Science Advisor

    While there are definitely stars outside of galaxies, the vast, vast majority are within them. There are approximately 100 billion galaxies visible from Earth, and they, on average, have approximately 100 billion stars each.

    We also expect that planets are the norm, but we don't actually know how common they are. Our observations of planets are so far very limited.
  4. Mar 28, 2010 #3
    Most of your star/planet ratio questions we just don't know yet, although they do seem more common than was originally thought.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook