Why are galaxies flat??
Ok here’s a simple explanation. Right… Firstly not ALL galaxies are flat. Only spiral and disk galaxies are flat. There are many eliptical ones that are almost perfect circles. Secondly, the ones that are round are usually acted on by gravitational forces, dark matter, and of course, centrifugal forces. And besides they are not “flat” they are actually a couple of hundred to thousand light years wide. In perspective the closest star to us is 4.6 light years away… But remember they can be up to 250,000 light years wide plus. Think of it this way. They are flat because they spin and are flattened out by all the huge forces surrounding them. Hope this helped.
