>If aliens did come here they'd have to be very brave, powerful enough not to worry about what we'd do
If aliens had the technology to visit us right now, the latter is a given.
You don't have to assume anything crazy. You can create a planet killer by simply accelerating a decently massive object at relativistic speeds and firing it at earth.
If aliens had the technology to visit us right now, the latter is a given.
You don't have to assume anything crazy. You can create a planet killer by simply accelerating a decently massive object at relativistic speeds and firing it at earth.