For a little over two years now, we've been watching with interest as more and more American space companies line up to compete for the right to build private space stations in orbit.

With the International Space Station (ISS) expected to deorbit and fall into the sea sometime in 2031, nearly a dozen different space companies -- many of them publicly traded space stocks -- are still in the competition:

It's these last two publicly traded opportunities that we'll be talking about today.

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Source Fool.com