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" ... In nebulae like W51 (the word “nebula” just means “cloud” in Latin), molecules are gathered together just closely enough for gravity to start pulling them together into clumps. As molecules fall together, their shared gravity pulls in even more molecules, and eventually they coalesce into gas giants like our solar system’s Jupiter. If the newly-formed gas giant gathers up enough material, something spectacular (and a little terrifying if you think about it too much) happens: the force of its own mass pressing inward actually crushes hydrogen atoms together so tightly that they fuse into helium. That’s called nuclear fusion, and it puts out a tremendous amount of energy. ... "
" ... That telescope was located atop Mount Wilson, and was the main instrument responsible for the most important revelation and revolution in astronomical history. Not only were the mysterious spiral nebulae determined to be their own galaxies, or “island Universes,” all unto themselves, but the Universe was determined to be expanding, not static, all because of this observatory. Today, the 41,000 acre Bobcat Fire rages with just 3% containment, threatening to burn down the now-evacuated observatory. Here’s how Mt. Wilson forever changed our view of the Universe. ... "
" ... These three planetary nebulae, all imaged by Spitzer, highlight features inherent to dying Sun-like... [+] stars. From left to right, the Exposed Cranium Nebula, the Ghost of Jupiter Nebula, and the Little Dumbbell Nebula all exhibit stellar winds, ejected material consisting of different elements, and a central, luminous stellar remnant. ... "
" ... We now know that a large fraction of galaxies beyond the Milky Way are spiral-shaped in nature, and ... [+] that all of the spiral nebulae we were considering in ~1920 are indeed galaxies beyond our own. But that was anything but a foregone conclusion during the time of Einstein. ... "