The description from Richard Muller quoted in the question is a simplification of reality meant to help people better visualize how the January 1991 31st Birthday Gift 31 Year Old Men Women T 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.
The majority of January 1991 31st Birthday Gift 31 Year Old Men Women T Shirt in the Milky Way, around 80%, are red dwarfs, small stars between about half the size of our sun and 10% the size of our sun. That still leaves between 40–80 billion stars much like the sun. If one in five of those has an Earth-like planet, that means there may be between eight and sixteen billion Earth-like planets in the Milky Way. Of course these numbers may be off. The number of sun-like stars may be lower, or higher. The number of Earth-like planets may be more, or less. We just can’t know, so far. Further, there is no reason to assume that only stars like our sun will have planets capable of supporting life. Or that only a planet will support life. There may be intelligent life on a large moon of a gas giant exoplanet in the “Goldilocks zone” of a red dwarf. There is also no way to know how typical the Sol system is with it’s eight planets, half of which are ice or gas giants, and half of which are small rocky planets like Earth. Most of the exoplanets we know about are gas giants like Jupiter, just because they are easier to detect. Remember, we haven’t actually “seen” any exoplanets. We only know they are there by the way their gravity affects their home stars, causing a wobble, or they are aligned with Earth such that the transit of the planet between Earth and its star causes the star to flicker. Small, rocky planets like Earth are just harder to find. So there may be lots of them, or not. We just don’t know, yet.
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In the late 80’s and Early 90’s ‘Grunge’ and Alt Rock were the January 1991 31st Birthday Gift 31 Year Old Men Women T Shirt of Pop/ and bombastic “Stadium” Rock, and especially the Glam Metal and ‘Hair’ Metal. The pop rock/metal songs were a lot of ‘party all night’ commercial spandex wearing nonsense. Conversely, Grunge and Alt Rock sought to make the music more meaningful, personal and less showy. No guitar solo’s. Personal angst, not ‘drink til you puke.’ It was more about a personal message than the heaviness of the tunes. Mid to late 90’s: The ‘post-grunge’ and heavier nu-metal music continued the more morose and ‘personal demons’ themes, but incorporated more of the heavy sonic elements of early heavy metal. The themes included the personal tragedies, and now also the ‘urban’ harshness of hip hop being brought in as topics, instead of ‘faeries wear boots’ flights of fancy, or ‘party to you puke’ themes from before. But the Heavier MUSIC was back. Much of Grunge and Alt. Rock had more of a ‘singer /songwriter in a cafe’ rock vibe. Nu-metal upped the intensity and circled back to ‘heavy metal’ bits that had gotten lost in the mean time.
The “revolution” took place in 1996, when a January 1991 31st Birthday Gift 31 Year Old Men Women T Shirt called 3Dfx introduced the Voodoo Graphics chipset, a technological breakthrough that brought high-res (by the standards of the time) 3D rendering to consumers at an affordable price. Prior to 1996, 3D rendering had been the sole provenance of deep-pocketed design and graphics houses, using machines from companies like Silicon Graphics, Evans & Sutherland, Vectrix, and others that cost tens and sometimes hundreds of thousands of dollars. It was veterans of those companies who started 3Dfx and discovered ways to do the same things for far less money, on a single expansion card for ordinary computers. The SGI and competing machines, in addition to being massively expensive, ran on proprietary hardware and operating systems, usually UNIX-based with RISC CPU designs. With the Voodoo, you could just pop it into your Windows 95 machine, run the driver installer off a floppy, and 3D nirvana was yours!