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time is warped by massive bodies
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"As you get closer to a black hole, the flow of time slows down, compared to flow of time far from the hole. (According to Einstein's theory, any massive body, including the Earth, produces this effect. Earth's gravity is so weak that the slowing of time is not noticeable, but the effect has been confirmed using sensitive instruments. For example, at sea level you age one-billionth of a second less every year than you would if you lived on top of Mt. Everest.)
"Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. For example, an object falling into the hole would appear frozen in time at the edge of the hole."
Factors affecting the flow of time:
Gravity or mass of an object slows the rate of time.
Altitude, distance from a massive object, speeds up the flow of time. In the movie "Interstellar," because the travelers were close to a black hole, an hour there was equal to seven years on Earth.
Motion, the faster you move through space, the slower you move through time.
Editor’s note: When I first started looking at this subject, I found it difficult to remember which factor increased or decreased the rate of time. But then I began to understand the process more, and now it’s not so confusing. Here’s how to look at it: Motion slows time because, think of the extreme case, if you were a photon traveling at the speed of light, there would be zero time for you, and so, we can think of any motion as just a step toward light-speed. Gravity, with its heavy hand, warps not only space but time, as well; as a result, time slows down. And altitude is just a variation on gravity; in that, the farther you are from a massive body, the less gravitational impact it will have on you, and therefore, altitude, or distance from a massive body, speeds up time.