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Transcript of Hoag's Object
It is described as a nearly perfect ring of hot, blue stars that pinwheel about the the yellow nucleus; the entire body is made up of about 8 billion stars.
There are 3 major theories for the formation of Hoag's Object:
The ring formed as a collisional ring
The ring formed through a bar instability which has since dissolved
Gas accretion (more recent) Discovered by Arthur Allen Hoag
It's a non-typical ring galaxy with an unknown formation process
Size: 75,000 light years The Basics OBJECTIONS:
no objects for a collision; the ring looks nearly constant in comparison to the central spheroid
lack of evidence for any residual bar in the central spheroid