if galaxies are ....?

the most power-full explosions in the universe according to astronomy magazine, why does it take 4.0 billion years to do so ??

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  • Anonymous
    1 decade ago
    Favorite Answer

    You'd better read the astronomy magazine again. Galaxies are not explosions - they are collections of stars held together by mutual gravity. There's other stuff in there too (dark matter, dust, etc.)...

    Are you sure you don't mean Supernova explosion or Gamma Ray Burst or something like that??

  • 1 decade ago

    Galaxies are a set of millions of stars that are held in an orbit around the central matter (which some say are supermassive black holes).

    The largest explosions in the universe is either a supernova, gamma-ray bursts or quasars.

  • 1 decade ago

    I don't know about a galaxy being an explosion, but if something was really really powerful, it could perhaps travel so far that it takes 4 billion years to flatten out.

  • 1 decade ago

    If you are talking about the big bang, then its because they've been expanding over such immensely large distances that even in that incredible amount of time they are still not as spread out as they will be. Take the nearest star to us (other than the sun), polaris, which is 431 light-years away from earth. That would take 431 years to get to that relatively close object, traveling at the speed of light! Obviously galaxies are not moving that quickly, so imaging the time it would take them to expand as far as they have!

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  • 1 decade ago

    No it is the black hole in the middle that furnishes the gravity so that bodies can orbit it. This gravity well can be 100 light years in diameter.

  • 1 decade ago

    Yeah...you definately didn't read that right or something...not sure what you are refering to exactly...??

  • Anonymous
    1 decade ago

    the 1st answer is correct..

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