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In the book "The Elegant Universe" Brian Green says Einstein once said everything in the universe is moving at the speed of light. How can this be? I thought bodies with mass couldn't reach c.
Einstein's belief is that everything in the universe, including light, moves at the speed of light in a vacuum, which is approximately 299,792,458 meters per second.
Einstein's theory of special relativity states that the speed of light is constant and does not depend on the observer's perspective. This means that no matter how fast an observer is moving, they will always measure the speed of light as the same value. Based on this principle, Einstein believed that everything must move at the speed of light.
While Einstein's theory of special relativity is widely accepted, it is still a theory and not a proven fact. There are some phenomena, such as gravitational waves, that appear to move faster than the speed of light. However, these are still being studied and do not necessarily disprove Einstein's belief.
Einstein's belief about everything moving at the speed of light has greatly impacted our understanding of the universe. It has led to the development of technologies like GPS, as well as new theories and discoveries in physics. It also challenges our traditional understanding of time and space, and has implications for the study of black holes and the expansion of the universe.
According to Einstein's theory of special relativity, it is impossible for anything with mass to reach the speed of light. As an object approaches the speed of light, its mass increases infinitely and it would require an infinite amount of energy to accelerate it to that speed. However, particles with no mass, such as photons, can travel at the speed of light.