When a black hole eats a nearby star, the resulting X-rays typically fade within a year or so. That's why astronomers are excited about a giant black hole that's been shedding telltale radiation for close to 10 years.
Supermassive black hole set a record for longest lunch ever
When a black hole eats a nearby star, the resulting X-rays typically fade within a year or so. That's why astronomers are excited about a giant black hole that's been shedding telltale radiation for close to 10 years.