science

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which of the statements below is true?

a) the stars in a galaxy are held together by gravity
b) Stars in a galaxy slowly rotate around a center
c) The Milky Way is the only galaxy in the universe
d)All of the above


just need to know if my answer is correct or wrong d

  • science -

    Since c) is wrong, d) can't be right.

    http://en.wikipedia.org/wiki/Galaxy

  • science -

    a ms sue

  • science -

    Right.

  • science -

    thanks

  • science -

    b is also true, for most stars anyway.

    If they did not rotate about the center, they would all collapse there.

    Some have already; that's why there is a black hole at the center.

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