Why is it a common belief that a person traveling in a spaceship at light speed, would age slower than his/her counterpart on earth?
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"Quote from www.halfbakery.com"
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According to the theory of relativity, time slows down as objects approach the speed of light. Theoretically, a person on a spaceship moving close to the speed of light would not age as fast as a person standing still. If the person on the spaceship could still travel fast and watch people walk around on Earth (if he can hypothetically see them) then it would look like from his point of view that the people were moving around faster than normal. And to the people on Earth, the man in the spaceship would appear to be moving slowly.
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"Quote from www.allaboutscience.org"
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The Theory of Relativity, proposed by the Jewish physicist Albert Einstein (1879-1955) in the early part of the 20th century, is one of the most significant scientific advances of our time. Although the concept of relativity was not introduced by Einstein, his major contribution was the recognition that the speed of light in a vacuum is constant and an absolute physical boundary for motion. This does not have a major impact on a person's day-to-day life since we travel at speeds much slower than light speed. For objects travelling near light speed, however, the theory of relativity states that objects will move slower and shorten in length from the point of view of an observer on Earth. Einstein also derived the famous equation, E = mc2, which reveals the equivalence of mass and energy.
When Einstein applied his theory to gravitational fields, he derived the "curved space-time continuum" which depicts the dimensions of space and time as a two-dimensional surface where massive objects create valleys and dips in the surface. This aspect of relativity explained the phenomena of light bending around the sun, predicted black holes as well as the Cosmic Microwave Background Radiation (CMB) -- a discovery rendering fundamental anomalies in the classic Steady-State hypothesis. For his work on relativity, the photoelectric effect and blackbody radiation, Einstein received the Nobel Prize in 1921.
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Neil Armstrong is 0.0000000001 second younger for traveling to the moon and back compared to everyone else
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