HANDSOME, super rich, investor with the latest outer space technology, the 21st century entrepreneur Elon Musk seems to be reiterating the hubris of the famous conqueror Julius Caesar over two millennia ago: veni, vidi, vici—“I came, I saw, I conquered.”

Musk said, “if the future does not include being out there among the stars and being a multiplanet species, I find that it’s incredibly depressing if that’s n