There are about 51 galaxies in the Milky Way’s Local Group, about 100,000 in our Local Supercluster, and 100 billion in all of the observable universe. Many of what we see as tiny specs are, in fact, galaxies, containing stars, which, in turn, may have their own solar systems, planets and satellites. While these galaxies may seem inactive in our lifetime, many activities occur at a macro timescale — stars are born, they collapse, merge; there’s dust in the galaxies; temperatures vary and many other fascinating things.
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