# X-ray 'Echoes' Probe Habitat of Monster Black Hole

Astronomers using data from the European Space Agency’s XMM-Newton satellite have found a long-sought X-ray signal from NGC 4151, a galaxy that contains a supermassive black hole. When the black hole’s X-ray source flares, its accretion disk reflects the emission about half an hour later. The discovery promises a new way to unravel what’s happening in the neighborhood of these powerful objects.

- Kind: Short
- Year: 2012
- Runtime: 1 min
- By: NASA/Goddard Space Flight Center
- Genres: Space
- Archive: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:X-ray_%27Echoes%27_Probe_Habitat_of_Monster_Black_Hole.ogv)
- Licence or status: Public domain (as the archive states it)
- Credit: NASA/Goddard Space Flight Center
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/commons/19756676?play=1)