there are 2 ways to look at the universe
1.consider the vast empty space between planets stars and galaxies as a big thing
and consider us a small thing

2.Einstein did it: space and time and curved heavily by the power of thought which creates planets and intelligent beings like you
so in this model Earth is very big
the sun is smaller than earth because it does not have a civ of 63 billion people on it
and so on
Mars is bigger than the Sun but smaller than Earth

hihi

and space does not matter so much
your intelligence curves space and time

this means that by focusing thoughts
you can travel through space and time