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.

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