The all-new way to always have the latest listings and values.Maintained by our expert staff (who also publish Linn's), we catalog all new stamp issues and regularly release stamp value updates. The Scott Catalogue of Postage Stamps is the foremost name in stamp collecting.Monday Morning Brief | New stamps in catalog.
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essays, proofs, trial colors and specimens, Fleischner U.S. Bahamas celebrates its 50th anniversary of independence with new stamps.The old runny postcard that changed a woman’s life forever.Kupiec-Weglinski, de Vries, Kaufmann receive 2023 APS Luff awards.But people on that ship think that you’re zooming past them – according to Einstein, they see your time as running slowly. We now understand that you will see timing running slowly on that other ship.
Suppose you are out in space, and another spacecraft zooms past. Could you tell which of the two spacecraft were moving – that is, could you tell if you were moving past the other craft or if it were moving past you? Suppose you are cruising along in space, and you pass by another spacecraft pointed in the opposite direction. But suppose you are cruising along in space, with no nearby objects by which to judge your motion. When you’re driving, say up Highway 280, you know you’re moving by watching trees and houses moving backwards with respect to you. That requires a bit of an extension of the discussion here.
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This does not address the affect that the massive black hole in the movie Interstellar has on time. The fabric of space and time is stretched for objects moving relative to you. In other words, it takes longer for the clock to tick, and longer ticks mean that you see time as running slowly on the ship. For this reason, each light pulse must travel farther, perhaps much farther, than simply twice the distance between the laser and the mirror.īecause the distance is longer, but the speed of the light is always the same (so said Albert Einstein!), you see the round trip for the light as taking a longer time. The same is true as the light pulse heads back after reflection. As the light pulse travels from the laser to the mirror, the mirror (and the rest of the clock) moves, so the light has to travel farther to get there. When the clock is stationary, each light pulse travels twice the distance between the laser and the mirror during one tick of the clock.īut imagine that our laser clock has been placed on a spaceship and you can see it as the spaceship zooms past Earth. To see how the nature of light affects time, imagine a clock for which each tick is the time it takes for a light pulse shot from a laser to reflect off a mirror and return to the laser. This is a fundamental law of the natural universe. Rather it will be 186,000 miles per second, the same as if you weren’t moving.
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If you’re zooming through space at 100,000 miles per second and aim your laser pointer straight forward, the speed at which the light comes out is not 100,000 plus 186,000 miles per second. So said Isaac Newton.īut not so with light! Light travels through empty space at about 186,000 miles per second. This is certainly not true for, say, a ball: it was well understood before Einstein came along that if you can throw a ball at 60 miles per hour and you throw a ball straight forward while riding a horse at 20 miles per hour, the ball will initially be moving at 60 plus 20, or 80 miles per hour. This might seem like the “fiction” part of science fiction, but time actually can and does run at different rates in different situations.Īlbert Einstein realized that the speed with which light travels doesn’t depend on how fast the source of the light is moving. While an hour or so passes for some, years go by for others. Without giving too much away, characters in the movie age at different rates. With the recent release of the movie Interstellar, lots of people have been wondering about time. Do you look around the natural world and wonder? Wonder why things work the way they do, why things are the way they are? If you do, then there’s a bit of physicist inside of you! Physics is all around us.
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