Just had a weird realization - right now it costs a not small fortune in fuel costs to go out to space, and is cheaper to stay down here. Once we're more or less space-bound, it will be cheaper to stay in orbit, and cost ridiculous amounts just to come down to visit a planet and come back up.
At some point in the future, it will probably be necessary to leave earth as the sun has a limited amount of years it will exist before it burns out. This is still very far into the future though.
Yep, like 5 billion years worth of fuel.
So "at some point" is pretty far-fetched. I seriously doubt even our civilization and our bodies will exist in its current or similiar form.
We are in trouble before the sun burns out. In 700 million years , as it ages, the sun has bloated enough to make life impossible: scorching hot desserts and evaporating oceans. Mars should be nice if it is terrraformed in time.
[citation needed]
From what i know, the sun will get bloated and turned into a red giant right before the end of its existence (so still few billions years to go).
