UKnowNow (ukn)

Do you know how did the universe come into existence? The most widely accepted explanation for the origin of the universe is the Big Bang theory. According to this theory, the universe began as an extremely hot and dense point as an initial singularity that contains all the matter and energy of the universe.

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English: Do you know the Big Bang was not an explosion in space but an expansion of space itself? 中文: 你知道大爆炸并不是在空间中的爆炸，而是空间本身的膨胀吗？

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Do you know right after the Big Bang, the universe was extremely hot and dense? The temperature right after the Big Bang was estimated to be around 10³² Kelvin. 你知道在大爆炸之后，宇宙极其炽热和密集吗？大爆炸之后的温度估计在10³²开尔文左右。

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Do you know how old is the universe? The age of the universe is estimated to be about 13.8 billion years. It is based on a variety of observations, including measurements of the cosmic microwave background radiation, the expansion rate of the universe (Hubble constant), and the ages of the oldest star clusters.

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