Elon Musk says his obsession with the red planet is cooling.

There are many different ways to get to Mars, but there are always tradeoffs. Chemical propulsion, proven the most popular, can quickly get a spacecraft to the red planet. But they come at a high cost ...

I've read that the planned crewed Mars missions will take six months or two years to arrive. Which is it? Could a longer trip be due to the heavy payload? Our rovers took only eight to nine months to ...