In the year 3, 000, 002, 012 the Andromeda Galaxy may collide with our Milky Way. At first this sounds miserable, like a collision of two bird flocks. But galaxy members fly farly, not tip to tip. In a galactic collision the stars do not actually collide-as with crisscrossing marching bands, only the interstices collide. (Oh to be like a galaxy, to mingle without wrecking. But then we would have to be composed of so much more sky.) The spaces between stars are so wide that thousands of galaxies have to converge before the stars will crash.
Charles Wallace and the unicorn moved through the time-spinning reaches of a far glazy, and he realized that the galaxy itself was part of a mighty orchestra, and each star and planet within the galaxy added its own instrument to the music of the spheres. As long as the ancient harmonies were sung, the universe would not entirely lose its joy.
Avice for a human. 87. Dark matter is needed to hold galaxies together. Your mind is a Galaxy. More dark than light. But the light makes it worthwhile. 88. Which is to say: don't kill yourself. Even when the darkness is total. Always know that life is not still. Time is space. You are moving through that galaxy. Wait for the stars.
Tom's theory of why human beings had yet to receive any message from extraterrestrial intelligences was that all civilizations, without exception, blew themselves up almost as soon as they were able to get a message out, never lasting more than a few decades in a galaxy whose age was billions; blinking in and out of existence so fast that, even if the galaxy abounded with earthlike planets, the chances of one civilization sticking around to get a message from another were vanishingly low, because it was too damned easy to split the atom.
A memory is a luminous miniature, like the hologram of the princess, in that movie, that the faithful robot carried in his circuits from galaxy to galaxy. The sadness inherent in any memory comes from the fact that its object is forgetting. All movement, the great horizon, the journey, is a spasm of forgetting, which bends in the bubble of memory. Memory is always portable, it is always in the hands of a wandering automaton.
The near side of a galaxy is tens of thousands of light-years closer to us than the far side; thus we see the front as it was tens of thousands of years before the back. But typical events in galactic dynamics occupy tens of millions of years, so the error in thinking of an image of a galaxy as frozen in one moment of time is small.
While the Copernican principle comes with no guarantees that it will forever guide us to cosmic truths, it's worked quite well so far: not only is Earth not in the center of the solar system, but the solar system is not in the center of the Milky Way galaxy, the Milky Way galaxy is not in the center of the universe, and it may come to pass that our universe is just one of many that comprise a multiverse. And in case you're one of those people who thinks that the edge may be a special place, we are not at the edge of anything either.
Neil deGrasse Tyson
I think that the event which, more than anything else, led me to the search for ways of making more powerful radio telescopes, was the recognition, in 1952, that the intense source in the constellation of Cygnus was a distant galaxy-1000 million light years away. This discovery showed that some galaxies were capable of producing radio emission about a million times more intense than that from our own Galaxy or the Andromeda nebula, and the mechanisms responsible were quite unknown... [T]he possibilities were so exciting even in 1952 that my colleagues and I set about the task of designing instruments capable of extending the observations to weaker and weaker sources, and of exploring their internal structure.
And we're not alone, you know, children, " came Mrs. Whatsit, the comforter. "All through the universe, it's being fought, all through the cosmos, and my, but it's a grand and exciting battle. I know it's hard for you to understand about size, how there's very little difference in the size of the tiniest microbe and the greatest galaxy. You think about that, and maybe it won't seem strange to you that some of our very best fighters have come right from your own planet, and it's a little planet, dears, out on the edge of a little galaxy. You can be proud that it's done so well." "Who have our fighters been? Calvin asked. "Oh, you must know them, dear, " Mrs. Whatsit said. Mrs. Who's spectacles shone out at them triumphantly. "And the light shineth in darkness; and the darkness comprehended it not." "Jesus!" Charles Wallace said. "Why of course, Jesus!" "Of course!" Mrs. Whatsit said. "Go on, Charles, love. There were others. All your great artists. They've been lights for us to see by.