The concept of space-time makes Star Trek-style warp drives theoretically possible, and researchers have proposed a way of detecting their use.
Alien Spaceships Could Be Detected Using Gravitational Waves
https://www.wired.com/story/alien-spaceships-could-be-detected-using-gravitational-waves/
And
The Biggest Controversy in Cosmology Just Got Bigger
A long-awaited study of the cosmic expansion rate suggests that when it comes to the Hubble tension, cosmologists are still missing something.
