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Black Hole
A black hole is an astronomical object whose gravity is so strong that nothing—even light—can escape from within its event horizon. It forms when a massive star’s core collapses or through other processes, and may have an accretion disk of infalling matter that emits radiation. Supermassive black holes at galaxy centers influence stellar orbits, and mergers produce gravitational waves.
Source: nasa.gov
APODs including "Black Hole"
Centaurus A: X-Rays from an Active Galaxy
16/08/2001
A Mystery In Gamma Rays
11/08/2001
The Orbiting Hubble Space Telscope
06/08/2001
The Galactic Center in Infrared
08/07/2001
Spiral Galaxy NGC 7742
01/07/2001
Around The Arches Cluster
14/06/2001
NGC 253: X-Ray Zoom
07/06/2001
X-Ray Stars of 47 Tucanae
24/05/2001
The Center of the Circinus Galaxy in X-Rays
16/05/2001
X-Ray Rainbows
11/05/2001
GRO J1655-40: Evidence for a Spinning Black Hole
08/05/2001
Chandra Deep Field
28/03/2001
Distant Galaxies in Radio Vision
08/02/2001
Black Holes Are Black
19/01/2001
A Year of Resolving Backgrounds
30/12/2000
Sgr A*: Fast Stars Near the Galactic Center
20/12/2000
Too Close to a Black Hole
10/12/2000
The Circinus Galaxy
04/12/2000
X-Ray Cygnus A
10/11/2000
The Cosmic X-Ray Background
09/11/2000
The Perseus Cluster's X-Ray Skull
31/10/2000
Gemini North Images Bow Shock Near Galactic Center
17/10/2000
The Center of Centaurus A
01/10/2000
M82's Middle Mass Black Hole
14/09/2000
X-Rays From Antennae Galaxies
18/08/2000
A Jet from Galaxy M87
06/07/2000
The Long Jet of Pictor A
19/06/2000
X-rays From The Perseus Cluster Core
15/06/2000
A Bubbling Galaxy Center
12/06/2000
X-Ray Wind From NGC 3783
01/06/2000