[USNBandit]

If aliens have the ability to travel far enough to get to Earth from anywhere else, we better hope they are friendly. That kind of technology will probably include some pretty awesome death rays.

[KarlInOhio]

If aliens have the ability to travel far enough to get to Earth from anywhere else, we better hope they are friendly. That kind of technology will probably include some pretty awesome death rays.

Hopefully interstellar travel is pretty simple like in Harry Turtledove's The Road Not Taken. Otherwise we would be about like the Aztecs and Incas standing up to the Spanish.

[Little Ray]

Or just a styrofoam cup hitting earth at .99c.

[PapaBear3625]

If aliens have the ability to travel far enough to get to Earth from anywhere else, we better hope they are friendly. That kind of technology will probably include some pretty awesome death rays.

The conquistadors who landed in South America has awesome weapons relative to the Indians they found there. They also were a hell of a long way from resupply, which would be a vulnerability.

Any actual alien invader would probably not bother with death rays. They would just tow a few asteroids into intercept orbits against the Earth. A few hundred-megaton-equivalent hits on major cities and the governments of Earth would be very compliant.