This is ominous, given that some private space-launch companies, including SpaceX, have an explicit goal of creating new civilizations off Earth. But truth be told, we don’t even know if you can actually do the fun part of making space kids. While the moon and Mars provide some gravity, the vast majority of data on space physiology comes from orbital space stations, where free-falling astronauts hang in midair. But what happens after the unchastity belt is unbuckled, the snuggle tunnel sheepishly exited? Bone loss may be less of a problem on Mars, which has 40 percent of Earth’s gravity.

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Persons: popularizers James, Alcestis Oberg, Dr, Thomas Heppenheimer, Samuel Coniglio, There’s, Vanna Bonta’s 2suit Organizations: SpaceX, Astronauts, Space Tourism Society Locations: China