NASA once envisioned life after Earth in these funky floating colonies

• When humans finally outstay their time on Earth, we're going to need a plan B.

• In the 1970s, physicists from Princeton University, the NASA Ames Research Center, and Stanford University imagined what this future home might look like.

• They created these artistic renderings of massive orbiting spaceships for life after Earth in the unfortunate case that our planet is destroyed.

• As you will see, the designs unearthed by The Public Domain Review are pretty strange.