The race to commercial space flight has well and truly started, with more than 85 companies and organizations seeking a future in interplanetary tourism. Yet some researchers worry we might be getting ahead of ourselves.
Before travel outside of Earth becomes a regular event, the world needs to implement some basic biosecurity measures, they warn. Otherwise, we could start receiving unwelcome alien visitors.
If a foreign organism manages to hitch a ride back to our planet on one of our spacecrafts, it could wreak havoc on Earth's equilibrium.
The chance of that actually happening is improbable, especially since we haven't yet found life outside of Earth. But given how bad it could get, it's a reality some think we should prepare for.
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