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Home Science & Environment Space Exploration

NGC 6946 – An Intermediate Spiral Known as the Fireworks Galaxy

June 5, 2025
in Space Exploration
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A vibrant, detailed image of the spiral galaxy NGC 6946, also known as the Fireworks Galaxy. The galaxy’s bright yellow core is surrounded by swirling spiral arms glowing with red and blue regions of star formation, all set against a dense background of stars.
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Explore NGC 6946, the Fireworks Galaxy — an active starburst galaxy on the Cepheus-Cygnus border known for its high rate of supernovae.

Lying on the border of Cepheus and Cygnus, NGC 6946 is a face-on spiral set in a very rich star field, and is sometimes called the Fireworks Galaxy. Credit: Tony Hallas

NGC 6946 is a bright galaxy sometimes called the Fireworks Galaxy due to its high rate of supernovae. It lies in a very rich star field right on the border of Cepheus and Cygnus. 

This object is an intermediate spiral, meaning it structurally leans a little toward being a barred spiral. It was discovered by William Herschel in 1798. The galaxy lies approximately 25 million light-years away, placing it midway between our Local Group of galaxies and the Virgo Cluster.

NGC 6946 is a poster child for supernovae, which underscores its nickname. Bright supernovae in NGC 6946 have occurred in 1917, 1939, 1948, 1968, 1969, 1980, 2002, 2004, 2008, and 2017. This galaxy has shown at least 10 times the rate of supernova production as the Milky Way, and the magnitudes of these supernovae have ranged from 11 to 16. 

Due to its extremely high production rate of stars, NGC 6946 has been classified as a starburst galaxy. 

The galaxy shows some unusual structure, some of which is visible in very large amateur telescopes, and this includes several bubbles, large open clusters, and supernova remnants.

Tags: Deep-Sky DreamsDeep-Sky Objects
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