That’s not correct. Physics can absolutely prove it.
I assume you mean human science and physics can’t prove it. Human science also can’t prove how the universe exists, yet we know of at least 100’s of billions of galaxies:
“This led to an estimate that the observable universe contained about 200 billion galaxies.
The new research shows that this estimate is at least 10 times too low.”
The universe suddenly looks a lot more crowded, thanks to a deep-sky census assembled from surveys taken by NASA's Hubble Space Telescope and other
www.nasa.gov
“Astronomers estimate that the universe could contain up to one septillion stars - which in numbers is 1,000,000,000,000,000,000,000,000.”
Astronomers estimate that the universe could contain up to one septillion stars – that’s a one followed by 24 zeros. Our Milky Way alone contains more than
universe.nasa.gov
Human science can’t prove where all of this came from, yet it clearly exists, doesn’t it?