"As for ETI who might want to destroy humanity and Earth, all it would take is one big hunk of metal moving at relativistic speeds. No armada full of laser-toting troops, no warning, and likely no way to stop it in time."
I have wondered what something small hitting earth at light speed would do. Not sure it would destroy earth.
Obviously something like a rock 100 km in diameter impacting Earth at 100 km/sec [1/3000th of speed of light] would kill most life on Earth. Considering there is no shortage of these size rocks which if barely nudged could hit earth at this velocity. For any ETI it would be very simple to exterminate humans.
Perhaps, that is another answer to Fermi Paradox- somehow they neglected the task [so far] in regards to humans. That or it's still on it's way.
Space/Science » in reply to Who in this solar system is building actual starships?
re: Who in this solar system is building actual starships?
The whole thread (56 posts)
- Aliens may have economic issues, too
- Think of seeds, not ivy+another solution to the paradox
- re: Aliens may have economic issues, too
- Maybe the answer is to use fewer resources...
- Interstellar travel is impossible, not just uneconomical
- False - Fusion sufficient
- Engineering Aliens - Think of Ayn Rand and Robert Heinlein
- FAST interstellar travel has a lot of hurdles for us at present
- We put our human limitations on any possible aliens.
- Not trying to
- re: Not trying to
- But what if that one species showed up a long time ago and left?
- Like I said, interstellar travel is impossible
- re: Not trying to
- Not trying to
- We put our human limitations on any possible aliens.
- FAST interstellar travel has a lot of hurdles for us at present
- re: Aliens may have economic issues, too
- Speculative
- re: Aliens may have economic issues, too