Aliens could be STRANDED on own planets because gravity is TOO strong
Aliens could be STRANDED on own planets because gravity is TOO strong
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.
Michael Hippke, an independent researcher affiliated with the Sonneberg Observatory in Germany, told Space.com: "On more-massive planets, spaceflight would be exponentially more expensive.
"Such civilisations would not have satellite TV, a moon mission or a Hubble Space Telescope."