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He also has interesting ideas about how to terraform Mars, which involve thermonuclear bombs at the poles. I don't personally know enough about the science behind it, but there's more information here - http://www.iflscience.com/space/elon-musk-says-we-could-terraform-mars-dropping-thermonuclear-bombs-it/.

I feel SpaceX is a interesting project. They have large scaled proposals for future space travel.