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Hubble Interacting Galaxy NGC 5256
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Name: NGC 5256, UGC 8632, Mrk 0266, I Zw 067, KPG 388
Description: Interacting Galaxies
Position (J2000): RA 13h 38m 17.68s Dec 48° 16' 34.6"
Constellation: Ursa Major
Distance: 350 million light-years (100 million parsecs)
Visual magnitude: 12.7
Angular size: 1.2 × 1.1 arcmin
Exposure Dates: November 16, 2001
Exposure Time: 36 minutes
Filters: F435W (B) and F814W (I)
Image Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble      Collaboration, and A. Evans (U of Virginia, Charlottesville/NRAO/Stony Brook      University)
Release Date: April 24, 2008

2017 Image:  G1720
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NGC 5256, also known as Markarian 266, is a striking example of two disk galaxies that are about to merge. Spectacular streamers of gas surround the two nuclei and eye-catching blue spiral trails indicate recent star formation. The shape of the object is highly disturbed and observations in various wavelength regimes - infrared, millimeter-wave and radio - provide additional evidence for a starburst in this system. NGC 5256 is located in the constellation of Ursa Major, the Great Bear, some 350 million light-years from Earth. It was discovered by William Herschel on May 12, 1787. Each galaxy also contains an active galactic nucleus, evidence that the chaos is allowing gas to fall into the regions around central black holes as well as feeding starbursts. Recent observations from the Chandra X-ray Observatory show that both nuclei, as well as a region of hot gas in between them, have been heated by the shock waves driven as gas clouds at high velocities collide.

This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on the occasion of its 18th anniversary on 24th April 2008.