Re: Earth 2.0?
Reply #60 –
Be aware that there's a decided difference in the distance between Earth and its Moon, and the distance between Earth and Mars.
The distance between Earth and its Moon is relatively short and doesn't vary much. We can--- if we wish to do it again-- send manned missions to the Moon and expect a round-trip in a matter of days--- weeks at the most if they spend much time there.
The distance between Earth and Mars is considerably greater, and varies by a huge margin. There's only a narrow window when a manned mission may launch from Earth and expect--- reasonably-- to get to Mars. Then, the planets get out of alignment for quite some time and it may be several months-- if not more than a year-- before the return trip can be made. If it can be made. The possibility has to be accepted that a manned trip to Mars could very well be a one-way trip.
Of course, if you've had a hankering to get away from it all a Mars mission could be your chance. Just don't get homesick--- if you do, you're bollixed.