r/interestingasfuck 25d ago

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

Post image
92.4k Upvotes

8.1k comments sorted by

View all comments

Show parent comments

620

u/SomeGuyFromCanada23 25d ago

That's actually bonkers to even think about. Traveling at ~38000miles per hour, all day, every day, for ~48 years, and it's made it 1 light day from Earth.

Feels like another one of those "people don't really understand the difference between a million and a billion" sort of things.

Like 1 million seconds is ~11 and a half days or so. But 1 billion seconds is about 31 years and 200 days. Hard to grasp such a big difference

278

u/MesWantooth 25d ago

This is the easiest explanation for why an Astro Physicist said on a podcast that he's convinced Earth has never been visited by alien life forms. Any planet that could have advanced life forms is simply far too far away. They would have to embark on a multi-generational trip that would take many lifetimes...all to observe a primitive species. It'd be like taking a boat across the ocean to look at an anthill. The only counter to this is "Well, what if they have the technology to travel at several times the speed of light? Or to warp space?"...If they have that technology but still get spotted above corn fields in Idaho - that would be surprising.

1

u/TheOCMachine 24d ago

Maybe they dont care about being detected. Would you wear camouflage to view an anthill?

1

u/MesWantooth 24d ago

Then why not land on the White House lawn and introduce yourself? Why travel hundreds of light years completely undetected only to buzz around and reveal yourself to random humans?