> we do not have enough time to become multiplanetary anyway (since that will take centuries, and we will likely never leave the solar system anyway). Neither

> we do not have enough time to become multiplanetary anyway (since that will take centuries, and we will likely never leave the solar system anyway). Neither of these statements are true. It's only a question of money, and money spent appropriately. Musk is demonstrating both of these. As soon as we have a self-sustaining base on Mars, we're multi-planetary. There have been enough experiments to show that a man-made self-sustaining bio-sphere is possible. If Musk's timeline happens, this could be easily within a century, if not decades. To quote a phrase, 'necessity is the mother of invention'. It's likely that settling on Mars will drive the science and research that will solve these problems. As for interstellar travel, that's well documented elsewhere on the web. It's doable, now, with current technology, without humans, but is massively expensive. And we don't know where to go. Once we do, it's just an engineering challenge for Musk V2 to solve.