By the Time Traveler. in 30,000,000 years from now. can have to see in that year. in the night sky. The dead stars are shown,
?
and the moon gone, and some rings on outer planets (except Pluto) may be disappeared.
Pluto dosn't have rings....
but in 100,000,000 years, the rings of largest planets. Jupiter and Saturn. would disappear.
We don't know this for sure... Some scientists say that the rings of the gaseous planets are only temporaneus phenomena so that may desappear in "a few" hundred thousends years.
Going back to time travel....
I've heard that another way to timetravel (in the past of course) would be using the immense gravitational field of a Black hole, but I don't know much about the argument. However if we find the way to use a black hole to time travel we still have to reach one of them in a reasonable time as the nearest is hundreds of light years away.
Another interesting thing about Einstein's Relativity:
To travel to the nearest star at the speed of light, the space ship will need more that 4 years RELATIVELY TO THE EARTH, infact because of the distorsion of time, the astronauts (depending on how fast the spaceship is moving) can finish the jurney in a few months or even a few days. We are still speaking of a very high fraction of c, like 99% of it...
Later I will add the formula, I just have to find it