Cosmology is a branch of astronomy involving the science of the universe's origin.
Because of the enclosed and finite nature of the universe, we cannot see"outside" of our own universe. Space and time began with the
. While there are a number of speculations about the existence of other universes, there is no practical way to observe them, and as such there will never be any evidence for them.The Big Bang did not happen at a single point but instead was the appearance of space and time throughout the entire universe at once, according toThe expansion of the universe gradually slowed down as the matter in the universe pulled on itself via gravity.
If other galaxies all seem to be rushing away from us, doesn't that place us at the center of the universe? No, because if we were to travel to a distant galaxy, it would seem that all surrounding galaxies were similarly rushing away. Think of the universe as a giant balloon. If you mark multiple points on the balloon, then blow it up, you would note that each point is moving away from all of the others, though none are at the center. TheAccording to data released by the Planck team in 2013, the universe is 13.8 billion years old, give or take a hundred million years or so, according to the.
"Patterns over huge patches of sky tell us about what was happening on the tiniest of scales in the moments just after our universe was born," said Charles Lawrence, the U.S. project scientist for Planck, in aWhether or not the universe will come to an end depends on its density — how spread out the matter within it might be. Scientists have calculated a"critical density" for the universe.
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