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 increased as a linear function of their distance. The only explanation for this observation is that the universe was expanding.
Metric expansion of space - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Metric_expansion_of_space
The observations of Edwin Hubble in 1929 suggested that distant galaxies were all apparently moving away from us, so that many scientists came to accept that the universe was expanding.
Accelerating expansion of the universe - Wikipedia, the free ...
https://en.wikipedia.org/.../Accelerating_expansion_of_the_universe
The accelerating expansion of the universe is the observation that the universe
appears to be expanding at an increasing rate. In formal terms, this means that ...
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