An overview of the Chandra mission and goals, Chandra's namesake, top 10 facts.
Classroom activities, printable materials, interactive games & more.
Overview of X-ray Astronomy and X-ray sources: black holes to galaxy clusters.
All Chandra images released to the public listed by date & by category
Current Chandra press releases, status reports, interviews & biographies.
A collection of multimedia, illustrations & animations, a glossary, FAQ & more.
A collection of illustrations, animations and video.
Chandra discoveries in an audio/video format.
Chandra Images by Category: Groups & Clusters of Galaxies

-Vast clouds of hot gas embedded with numerous galaxies.

11 Sep 08
A massive cluster of galaxies located about 2.3 billion light years away.
27 Aug 08
A powerful collision of two galaxy clusters about 5.6 billion light years away.
20 Aug 08
The central region of a rich galaxy cluster about 250 million light years from Earth.
05 Aug 08
The largest galaxy in the Virgo cluster of galaxies at a distance of 60 million light years away.
04 Feb 08
An elliptical galaxy at a distance of about 300 million light years.
10 Jan 08
A sample of nine galaxies each containing supermassive black holes in their centers.
20 Sep 07
A giant cluster of galaxies about 220 million light years from Earth with galaxy ESO 137-001 plunging into it.
16 Aug 07
A system where at least two massive galaxy clusters have collided.
06 Aug 07
A four-way collision of galaxies about 5 billion light years away.
24 Jul 07
Two clusters of galaxies about 5.7 billion light years from Earth.
24 Jul 07
Two clusters of galaxies about 5.7 billion light years from Earth.
30 May 07
Evidence for an awesome upheaval in a massive galaxy cluster was discovered in a Chandra image.
03 Jan 07
Astronomers have found a black hole where few thought they could ever exist, inside a globular star cluster.
02 Nov 06
A galaxy cluster located about 2.6 billion light years away in the constellation of Camelopardus.
05 Oct 06
An elliptical galaxy known in the Virgo cluster about 50 million light years away.
21 Aug 06
Site of a collision between two large galaxy clusters about 3.4 billion light years from Earth.
08 Aug 06
A galaxy cluster about 4.5 billion light years away.
08 Aug 06
A galaxy cluster about 2.2 billion light years away.
08 Aug 06
A galaxy cluster about 2.6 billion light years away.
08 Aug 06
A galaxy cluster about 3.5 billion light years away.
08 Aug 06
A galaxy cluster about 2.1 billion light years away.
08 Aug 06
A galaxy cluster about 1.4 billion light years away.
24 Apr 06
An elliptical galaxy 55 million light years away.
06 Apr 06
A galaxy cluster with a central galaxy, NGC 1128, that has produced a giant double radio source known as 3C 75.
01 Dec 05
The central region of a rich galaxy cluster about 250 million light years from Earth.
08 Apr 05
Distant galaxy clusters compared with counterparts that are relatively close by.
25 Jan 05
A starburst galaxy located in galaxy cluster Abell 1367, about 300 million light years away.
05 Jan 05
A cluster of galaxies 2.6 billion light years from Earth.
29 Oct 04
A galaxy in the constellation of Virgo.
08 Sep 04
A nearby galaxy cluster about 65 million light years from Earth.
13 Aug 04
A massive galaxy cluster about 3 billion light years from Earth.
18 May 04
A galaxy cluster 1 billion light years away.
18 May 04
A galaxy cluster 3.5 billion light years away.
18 May 04
A galaxy cluster 6.7 billion light years away.
10 May 04
Long-exposure image of the giant elliptical galaxy M87.
06 Jan 04
A galaxy being ripped apart as it races at 4.5 million miles per hour.
02 Jan 04
A color composite image shows the X-ray light from 70-million-degree Celsius gas in the cluster.
03 Sep 03
Two galaxies in the Virgo galaxy cluster that are more than 100,000 light years apart.
01 Sep 03
A 53-hour Chandra observation of the central region of the Perseus galaxy cluster.
11 Jun 03
Galaxy cluster Abell 2029 is approximately one billion light years from Earth.
21 May 03
One of two massive galaxies that are enveloped by vast clouds of high-energy particles.
21 May 03
One of two massive galaxies that are enveloped by vast clouds of high-energy particles.
08 May 03
A compact group of galaxies about 280 million light years from Earth.
13 Sep 02
A galaxy cluster in the constellation Serpens.
04 Apr 02
A cluster of galaxies about 500 million light years from Earth in the constellation Coma Berenices.
20 Feb 02
An extremely hot galaxy cluster about 4 billion light years from Earth.
29 Jan 02
A cluster of galaxies about 170 million light years from Earth, located in the constellation Centaurus.
08 Jan 02
A cluster of galaxies about a billion light years from Earth, located in the constellation Aquarius.
06 Sep 01
A galaxy cluster located 2.5 billion light years from Earth.
06 Sep 01
A galaxy cluster located 3.1 billion light years from Earth.
06 Sep 01
A cluster of galaxies 4 billion light years distant in the constellation Draco.
05 Mar 01
A new Chandra image shows remarkable detail and complexity in the central region of a compact galaxy.
15 Feb 01
A cluster of galaxies some 10 billion light years from Earth.
04 Dec 00
A cluster of galaxies with a prominent 'cooling flow'.
01 Jun 00
Features revealed in the core of the galaxy cluster.
01 Mar 00
A cluster of galaxies in the constellation Corona Borealis.
09 Dec 99
A cluster of galaxies in the constellation Hydra.
16 Nov 99
A large galaxy in the center of a cluster of galaxies located in the constellation Boötes.