Subject: Re: Richard Feynman explains why Mars a one way trip
That can theoretically last far longer than the billion years the earth has left in the habitable zone.

OMG! Time’s a-wasting!

But seriously….. a billion years ago, green algae was the going life form, just beginning to branch out int what would become the plant kingdom. Still hundreds of millions of years in the future lay the age of dinosaurs.

Who/what will our evolutionary descendants be in a billion years?

At the rate we’re going, it could be cockroaches….. or even green algae.

Shielding against cosmic rays might not even register on their list of things to be concerned about, assuming they can form a thought.