Reasons For The Existence Of The Big Bang

762 words - 4 pages

The Big Bang is the theory that the universe was once much smaller and hotter than it is now, and it has been expanding and cooling over time. With an understanding of a few key pieces of evidence one can understand the basis of the theory. The strongest pieces of evidence for the Big Bang are the movement of distant galaxies, the expansion of space time, and the hydrogen and photons in the universe.
Measurements of the motion of distant galaxies reveal that they are all moving away from us, with farther galaxies moving away at higher speeds. The movement of distant galaxies is measured with a spectrometer, which can measure the brightness of the light, the type of atoms the light came ...view middle of the document...

The only way this could be true is if space was not expanding relative to a center, but rather expanding everywhere in the universe at roughly the same rate. If the universe is expanding, then it must once have been much smaller than it is today, just as the idea of the Big Bang suggests.
One of the most compelling pieces of evidence for the Big Bang is cosmic background radiation, which is the name given to the low energy photons, or light particles, spread evenly throughout the galaxy. Since these photons all have the same temperature of 2.7 Kelvin, they also have same energy. As space expands, the wavelength of photons traveling through space also expands. Since longer wavelength photons have a lower temperature and less energy than higher wavelength photons, this means photons cool and loose energy as they travel through expanding space-time, so the universe was once much hotter, just as the Big Bang predicts.
Another piece of evidence for the Big Bang is the fact that most of the atoms in the universe are hydrogen. Since the universe used to be filled with very high energy particles, when they hit each other they would interact, producing different particles. When high energy photons hit these...

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