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Jonnyb42
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How in the heck do physicists know that spacetime was created at the big bang just by observing galaxies moving away from each other? Couldn't that mean that that's when the MASS was created?
Spacetime is a concept that combines the three dimensions of space and the dimension of time into a single framework. It is a fundamental part of Einstein's theory of relativity and is used to describe the physical world.
Physicists study spacetime through a combination of theoretical calculations and experimental observations. They use mathematics, such as calculus and geometry, to develop models and equations that describe the properties of spacetime. They also use tools like telescopes and particle accelerators to make observations and test their theories.
Some key features of spacetime include its curvature, which is affected by the presence of mass and energy, and its ability to be affected by gravity. It also has a constant speed of light and can be distorted by high speeds and strong gravitational forces.
We know that spacetime exists through various experiments and observations that support the theories and equations developed by physicists. For example, the bending of light around massive objects, predicted by Einstein's theory of general relativity, has been observed and confirmed by multiple experiments.
Some current mysteries surrounding spacetime include the nature of dark matter and dark energy, which are thought to make up a large portion of the universe but have yet to be fully understood. Additionally, there are ongoing efforts to reconcile the theories of general relativity and quantum mechanics, as they currently have conflicting descriptions of spacetime at a very small scale.