We could detect a malfunctioning warp drive on an alien starship

Faster-than-light warp drives are theoretically possible to build, and if aliens are using them, we should be able to detect the gravitational waves produced when one goes wrong Faster-than-light warp drives are theoretically possible to build, and if aliens are using them, we should be able to detect the gravitational waves produced when one goes wrong  New Scientist – News