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Polar Ring Galaxy NGC 660

NGC 660 is one of only very few (about 10) polar ring galaxies known to us. Two galaxies stick together here and can't melt anymore. The reason for that is dark matter. Sticking in the bigger barred spiral galaxy is another small galaxy, the polar ring with a lot of blue stars.

Constellation: Pisces
Distance: 24.5 million light-years
Visual magnitude: 11.2
Diameter: 36 000 light-years
Type: SB(s)aP

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Photo: Sloan Digital Sky Survey
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