时间旅行与乔老爹的烟斗

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Time Travel And Papa Joe’s Pipe ✨  One When astronomers point their telescopes to the nearest large galaxy, Andromeda, they see it as it was two million years ago. That’s about the time Australopithecus was basking in the African sun. This little bit of time travel is possible because light takes two million years to make the trip from there to here. Too bad we couldn’t turn things around and observe Earth from some cozy planet in Andromeda. ✨  Two But looking at light from distant objects isn’t real time travel, the in-the-flesh participation in past and future of Mark Twain’s  Connecticut Yankee  or H. G. Wells’s  Time Traveler . Ever since I’ve been old enough to read science fiction, I’ve dreamed of time traveling. The possibilities are staggering. You could take medicine back to fourteenth-century Europe and stop the spread of plague, or you could travel to the twenty-third century, where people take their annual holidays in space stations. ………………………………