Astrophysicists have discovered that black holes release jets of material at specific points in their feeding cycle, regardless of their size.

Researchers have identified the specific conditions under which black holes launch powerful jets of material back into space, a phenomenon described as a "burp." By studying how black holes interact with stars, scientists determined that these jets occur during two distinct phases of the feeding cycle. This discovery allows for more precise predictions of when these cosmic events will take place, potentially optimizing the use of telescope observation time.

The Mechanics of Cosmic Feeding

Black holes are characterized by an event horizon, a boundary from which light and matter cannot escape. While they are often viewed as cosmic sinkholes, astrophysicists describe them as "messy eaters." When a star wanders too close to a black hole, it undergoes a process called "spaghettification," where the star is stretched and torn apart. Only about half of the star's material is typically consumed by the black hole; the remainder is ejected into space as powerful jets that can influence the evolution of an entire galaxy.

Predicting Jet Ejection

The study found that both supermassive black holes—ranging from hundreds of thousands to billions of times the mass of the sun—and smaller stellar-mass black holes release jets at the same point in their feeding cycle. The first phase occurs during high-rate feeding, while the second happens hundreds to thousands of days after the star is destroyed. This second phase triggers when the feeding rate drops to approximately 2% of the black hole's maximum swallowing capacity. Because radio frequencies allow scientists to observe these jets as they move outward, this consistent threshold provides a reliable window for future astronomical study.