THE UNIVERSE The universe (Latin: universus) is all of space and timelal and
their contents, 10) including planets, stars, galaxies, and all other
forms of matter and energy. While the spatial size of the entire
universe is unknown, 31 it is possible to measure the size of
the observable universe, which is currently estimated to be 93
billion light-years in diameter. In various multiverse hypotheses, a
universe is one of many causally disconnected il constituent
parts of a larger multiverse, which itself comprises all of space
and time and its contents.
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The physical universe is defined as all
Ilontively referred to as spacetime)
how old is this earth?