So Bill Nye talked about this possibility in a YouTube video that I saw. We know Mars has water and collided with an asteroid like 3 billion years ago, propelling stuff out into space. There are rocks of Martian origin here on Earth. 
I think Bill Nye presented it as a curious possibility that is plausible but not that likely.
                
                
                    I think Bill Nye presented it as a curious possibility that is plausible but not that likely.
Looks like we're not going down after all, so nevermind.
                
             

