Raisins that are even farther away will appear to be moving away even more quickly. Raisins that are farther away will appear to move away way quickly, as there is more dough between them and you than the closer raisins. The closest raisins to you will appear to move away from you, as the dough expands. After that, if you put your finger down on one raisin, what do you see the other raisins doing in the meantime? Now assume that the dough leavens, and expands in all directions. Imagine you have a ball of dough with raisins all over it. Let us then take the example of the “Raisin bread” model of the expanding universe. Two, the speed of light is 299,792 km/s, so isn’t that hypothetical object we assumed 5000 megaparsecs away actually moving from us at speeds exceeding the speed of light? One, it’s not moving at that speed through space, but rather this is the effect of the space between objects expanding. 340,000 km/s from us.īut this is confusing for two reasons. If something is 30 megaparsecs away from us, we would expect to see it moving away at 2,040 km/s from us if it’s 5000 megaparsecs away, we would expect it to move away at approx. It means if you look at a galaxy 1 megaparsec away, it will appear to be receding at 68km/s away from us. Megaparsec means distance: One megaparsec is 1 million parsecs, which means 3.26 million light-years. The modern value is 68 kilometers per second per megaparsec, approximately. Unfortunately, the number he got was way wrong. Edwin Hubble was the first one to measure the expansion rate. Imagine again a bunch of folks standing at the edge of the cosmos, gently tugging the fabric of space-time, stretching it. Now let us apply this example to the universe.
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