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Galaxy Hoag's Object

One of the rare cases of a ring galaxy. Young blue stars form a ring around the old core, in between is a gap with only a few stars. This strange form emerged from a collision of two galaxies 2 - 3 billion years ago, whereas a smaller galaxy flew right through the middle of the former spiral galaxy.

Constellation: Serpens
Distance: 600 million light-years
Diameter: 120 000 light-years

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Photo: Nasa
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