本题目来源于试卷: Astrophysics and Cosmology，类别为 IB物理学
[问答题]
Compare an explosion on En9.3nk 9w-k)pu kewck arth to the Big Bang. Consider such qllm-qsb : : uzhf*u)/(:xszlb uestions as: Would the debris spread at a higher speed for more distant particles, as in the Big Bang? :mzs(:f/lz- xu )lhqsblu:b * Would the debris come to rest? What type of universe would this correspond to, open or closed?
参考答案:
An explosion on Earth blows pieces out into the space around it, but the Big Bang was the start of the expansion of space itself. In an explosion on Earth, the pieces that are blown outward will slow down due to air resistance and the farther away they are the slower they will be moving and then they will eventually come to rest, but with the Big Bang, the farther away galaxies are from each other the faster they are moving away from each other. In an explosion on Earth, the pieces with the higher initial speeds end up farther away from the explosion before coming to rest, but the Big Bang appears to be relatively uniform where the farthest galaxies are moving fastest and the nearest galaxies are moving the slowest. An explosion on Earth would correspond to a closed universe, since the pieces would eventually stop, but we would not see a “big crunch” due to gravity as we would with an actual closed universe.
本题详细解析:
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