Have you been watching the all-new "Late Show with Stephen Colbert"? Since the comedian replaced Dave Letterman behind the desk, he's had some big name guests. But the one with the most interesting thing to say was billionaire tech honcho Elon Musk.
Musk is the CEO of electric car company Tesla and SpaceX, which builds rockets and sends supplies to the International Space Station on its Falcon rockets. After talking to Colbert about Tesla, the "Late Show" host asked him about traveling to Mars, something Musk has said he aspires to do.
Musk called Mars "a fixer-upper of a planet" because it's far too cold for humans to live in and its atmosphere is less than one percent oxygen. But he brought up a couple of different ways to warm up the Red Planet when he was talking with Colbert.
One possibility is to simulate the global warming here on Earth by gradually releasing greenhouse gases on Mars. But he had another, more audacious plan to heat up Mars for human habitation.