Calandrelli, 37 — a TV science program host and aerospace engineer who became the 100th woman in space ... which showed her floating upside down in zero gravity as she stared out at Earth ...

“Zero gravity is safe and a fun type of thing ... The clip concludes with the two women floating back down to their seats while laughing uproariously over their ridiculous predicament.

Over 60 women have traveled to space, yet none were pregnant during the trip, let alone gave birth while floating in zero gravity. But with talk of future space colonies and cities on Mars ...