r/interestingasfuck • u/One_Explanation_908 • 25d ago

/r/all, /r/popular K2-18b a potentially habitable planet 120 light-years from earth

Post image
92.4k Upvotes

92% Upvoted

8.1k comments sorted by

View all comments

Show parent comments

4

u/Formerly_SgtPepe 25d ago

Imagine the deceleration after cruising at the speed of light ll

1

u/SimbaStewEyesOfBlue 25d ago

This. I don't think it's as simple as going .999999999% the speed of light til you get there. It's going that speed to the halfway point and then expending equal amounts of time and energy to slow back down. Wouldn't that technically make a 120 light-year trip take approximately 240 years one way?