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The description from Richard Muller quoted in the question is a simplification of reality meant to help people better visualize how the Original Lsu Tiger Welcome To The Series 2023 Pocket Baseball Shirt of spacetime works. In reality the galaxies are moving through spacetime in a complex fashion, based on the combination of all the forces acting on them, primarily the gravity of nearby galaxies and galaxy clusters. In the case of the Milky Way and Andromeda, these two galaxies are part of a gravitationally bound cluster of galaxies, called the Local Group. The dominant force that determines the movements of objects within the cluster is the combined gravitation of all the mass in the cluster, and not the expansion of spacetime. In other words, the gravitational attraction that the Milky Way and Andromeda have for one another that is drawing them together is stronger than the expansion of spacetime between them that would otherwise push them apart, and thus attraction wins and the two galaxies are on a collision course. In the same vein, the gravitational force that holds the earth in orbit around the sun is stronger than the expansion of spacetime between the earth and the sun (the expansion of spacetime at that distance being very small), and so the earth’s distance from the sun is not increasing for that reason. Likewise you are not flying apart because the molecular bonds holding the atoms in your body together are stronger than the minuscule expansion of spacetime between them in your body. The Local Group as a whole, however, is moving away from other galaxies and galaxy clusters to which it is not gravitationally bound, due to the expansion of spacetime.
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So, are there lots of Live From Cma Fest Nashville Tennessee T shirt systems like our own? We don’t know. Are systems like ours the only place life, especially intelligent life, can develop? We don’t know. Unfortunately, this area of science is still in the tedious process of collecting sufficient data to make reliable predictions. We know for certain there are exoplanets out there, and there are LOTS of them. The chance that some of them are like Earth is very high. The chance of finding lots of star systems similar to our own is also pretty high; there is no reason to assume we are unique. As our techniques for finding exoplanets get better, as we build better telescopes and better ways of interpreting the data they deliver, we will almost certainly find star systems very like our own. It will just take time.
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