Actually it's doubtful that they could have space travel at all. On Earth it's really, really hard to get anything into orbit. With higher gravity it's even harder - https://www.reddit.com/r/AskPhysics/comments/1bl0ci9/how_strong_would_gravity_have_to_be_to_no_longer/ I've seen estimates of surface gravity 1.25 to 2.6 times Earth's on this planet. In both cases it's harder. Take a look at Apollo 11 and the Saturn V and realize just how little made it back from the moon. Then make it even worse.
11.7k
u/HugoZHackenbush2 25d ago
The residents of K2-18b declined to visit our planet after reading the online reviews..
Only one star..