For humans on Earth, it is relatively easy to get in to space as the gravitational pull of our planet is not too strong.
However, on super-Earths – planets which are similar to ours but much bigger – the gravitational pull would be much stronger, making it harder to escape.
Planets around other stars with similar conditions to Earth can be up to 10 times the mass of our own.
NASA has previously discovered these super-Earths could, if they are in a habitable zone around their star ... Read even more
