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Defying Cosmic Convention
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Name: NGC 3447
Description: Interacting Galaxy
Position (J2000): RA 10h 53m 25.20s Dec 16° 46' 42.34"
Constellation: Leo
Distance: 60 million light years
Visual magnitude: 13.3
Angular size: 3.8 2.2 arcmin
Field of view: 2.70 x 2.31 arcminutes
Orientation: North is 40.5° left of vertical
Image Credit: ESA/Hubble & NASA
Release date: March 20, 2017
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Some galaxies are harder to classify than others. Here, Hubble’s trusty Wide Field Camera 3 (WFC3) has captured a striking view of two interacting galaxies located some 60 million light-years away in the constellation of Leo (The Lion). The more diffuse and patchy blue glow covering the right side of the frame is known as NGC 3447 — sometimes NGC 3447B for clarity, as the name NGC 3447 can apply to the overall duo. The smaller clump to the upper left is known as NGC 3447A.

The trouble with space is that it is, to state the obvious, really, really big. Astronomers have for hundreds of years been discovering and naming galaxies, stars, cosmic clouds and more. Unifying and regulating the conventions and classifications for everything ever observed is very difficult, especially when you get an ambiguous object like NGC 3447, which stubbornly defies easy categorization.

Overall, we know NGC 3447 comprises a couple of interacting galaxies, but we’re unsure what each looked like before they began to tear one another apart. The two sit so close that they are strongly influenced and distorted by the gravitational forces between them, causing the galaxies to twist themselves into the unusual and unique shapes seen here. NGC 3447A appears to display the remnants of a central bar structure and some disrupted spiral arms, both properties characteristic of certain spiral galaxies. Some identify NGC 3447B as a former spiral galaxy, while others categorize it as being an irregular galaxy. NGC 3447 was discovered by John Herschel on March 18, 1836