How Black Holes Are Detected
Accretion Disks: When a black hole pulls in gas and dust, it forms a swirling disk around it called an accretion disk. This disk gets super hot due to friction, and emits light across various wavelengths, including X-rays. By detecting this kind of intense radiation, astronomers can infer the presence of a black hole.
Stellar Orbits: A black hole's immense gravity can cause nearby stars to whip around it at incredible speeds. By observing a star's unusual orbit, astronomers can calculate the mass and location of the unseen object it's orbiting, which could be a black hole.
Gravitational Lensing: Black holes have such strong gravity that they can bend and distort the light coming from objects behind them. This phenomenon, called gravitational lensing, acts like a giant magnifying glass. Astronomers can use this distortion to detect the presence of a black hole, even if it's completely obscured.