Summary:
- Astronomers have observed a rare cosmic event where the supermassive black hole at the center of a distant galaxy has "woken up" after a 20-year slumber.
- The black hole, located in the galaxy known as SDSS J1430+2303, suddenly started emitting intense X-ray radiation, indicating a surge in activity and accretion of matter.
- This sudden reactivation of the black hole has surprised astronomers, as supermassive black holes are typically thought to be relatively stable and inactive for long periods of time, making this event a rare and significant observation.