Alien megastructures could be harnessing the energy of black holes, say scientists

The video discusses the concept of Dyson spheres, structures that could harness energy from black holes for alien civilizations. It explores various energy sources within black holes, such as friction in accretion disks and relativistic jets. The potential detection of Dyson spheres through ultraviolet or infrared signals is also covered. Different structural forms of Dyson spheres, like satellites or ring structures, are considered. The challenges of energy instability in black holes and the risks of large bursts destroying orbiting structures are highlighted.

What kind of signals might indicate the presence of a Dyson sphere around a black hole?

What precautions would alien civilizations need to take when harnessing energy from black holes?