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The two galaxies are presently a You Just Got Hucked Sarah Huckabee Sanders Shirt two million light years, give or take, from each other. They are expected to collide, and eventually merge, several billion years from now. Don’t worry, it won’t affect us much. For starters, we won’t be around. The Earth will be a dead world by then, with the Sun near the end of its life as a main sequence star. But even if that weren’t the case, stars are so small compared to the distances between them, no individual solar systems are expected to collide as this merger takes place. It cannot be excluded with certainty of course, but it is unlikely that any star during the merger event will come much closer to the Sun than our nearest stellar neighbors are at present, i.e., never approaching our Sun closer than a couple of light years.
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The universe expands from an unimaginably hot and Team Sesh Band Drunktoads Souvenir Ringer shirt speck (perhaps a singularity) with all the known forces unified. In a tiny fraction of a second tremendous changes are unleased. The strong force separates from the electronuclear. The weak force then separates from the electromagnetic. ~1 microsecond into this process Quarks are confined within hadrons. 1 millisecond in hydrogen nuclei are formed. 1 second in neutrinos begin to interact with other particles. At about the 3 minute mark helium nuclei are formed. 379,000 years in, the plasma cools enough for stable atoms to form and photons are released from this veil forming the Cosmic Background Radiation we see today. It’s 100 million years before the first stars can form, many generations of stars are busy creating the heavy elements necessary for life as we know it from the process of fission (both during the life of the star and during nova, supernova, and stellar collisions including those of neutron stars). All of these things almost certainly had to happen before life could form. So that’s somewhere around 1 billion years later before there is likely to be a place that is hospitable to life as we know it. But that’s even before galaxies have formed so that may be way too early, we just don’t know for certain.
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