According to flat earth theory, the universe is only 500,000 miles big?
What will happen when earth accelerates to the end?
Why do you assume there is an end?
So you admit the universe is infinite?
Are you saying that since I have no knowledge regarding the size of the universe, I must conclude that it is infinite? I'm afraid that I'm not following your logic here.
The universe is expanding AND the expansion is accelerating.
It was in 1929, that Edwin Hubble presented evidence that the universe is expanding.
Meaning it's not constant - no more than distance (the length), time and mass are also not absolutes as addressed in Einstein's "special theory of relativity" (in 1905), which is not to be confused with his general theory of relativity (in 1916) where he wove gravity, space, and time together and refined the physics of Isaac Newton.
Well we already knew that la supernovas are exploding stars that shine brightly as a billion suns for a short time, and astronomers use these supernovas
as a standard of measurement. However in 1998 while analyzing light from a special kind of supernova, astronomers found evidence that the universe expansion is ACCELERATING. However they did not know what was causing the accelerating of expansion. For one thing is seemed to work in opposition to gravity, and 2nd was not predicted by any of their current theories. Now their theories point toward dark energy.
Since Hubble's time, astronomers have been trying to measure as accurately as possible the rate of expansion, referred to as the "Hubble Constant."
I'm sure there are many out there that would disagree with the evidence found. Don't shoot the messenger, just the message.