When scientists talk about the expanding universe, they mean that it has been growing ever since its beginning with the Big Bang. The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest.
What does it mean when they say the universe is expanding ...
https://www.loc.gov/rr/scitech/mysteries/universe.html
The Expanding Universe - SkyServer - SDSS
skyserver.sdss.org/dr1/en/astro/universe/universe.asp
When he plotted redshift against relative distance, he found that the redshift of distant galaxies
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