Malin 1
Encyclopedia
Malin 1 is a giant low surface brightness
Low surface brightness galaxy
A low surface brightness galaxy, or LSB galaxy, is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky....

 disk galaxy which is 650,000 light years across; 5 and a half times the size of our Milky Way
Milky Way
The Milky Way is the galaxy that contains the Solar System. This name derives from its appearance as a dim un-resolved "milky" glowing band arching across the night sky...

. It was the first LSB galaxy verified to exist, and as such, is the first giant LSB galaxy identified. Its high surface brightness central spiral is 30,000 light years across; with a bulge of 10,000 light years. The central spiral is a SB0a type barred-spiral
Barred spiral galaxy
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in approximately two-thirds of all spiral galaxies...

.

It is extremely important even though its lack of brightness because of its size. With a diameter of what is 650,000 light years across that would make it the largest barred spiral galaxy ever to have been observed.
Malin 1 was once thought to be the biggest galaxy ever, at 1,000 times the diameter of the Milky Way.
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