A recent test using sound and the Doppler effect proves its theoretically possible.
getpocket.com
:extract_focal()/https%3A%2F%2Fhips.hearstapps.com%2Fhmg-prod.s3.amazonaws.com%2Fimages%2Fin-this-handout-photo-provided-by-the-national-science-news-photo-1593023688.jpg%3Fresize%3D640%3A*)
Here’s Exactly How Aliens Could Use Black Holes to Generate Energy
Scientists confirm a wild 50-year-old theory.