Why does the universe expand? This makes Einstein very "frustrated"!
China's ancient foremen were very intelligent, in the Han Dynasty ancient book Liu An's "Huainanzi Qi popular", it mentioned that "the quartet up and down the meaning of the space, to the present is called The Week", simply put, the space is space, Zeus is time, so cosmology is a study of space-time learning.
in the universe, time and space are basically the same thing. Because when you see the depths of the universe, you see the past. We usually refer to cosmological length units: light years, which look strange, like a unit of time, are actually units of length, representing the distance of light walking for a year.
is the distance of a year's walk? It's not very far, it's about 946 billion kilometers. How big is the Milky Way? More than 100,000 light-years in diameter, that is, from this end of the Milky Way to the other, it will take 100,000 years.
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