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Mona Evans
Mona Evans • 32 weeks ago

Hoag's Object in the constellation Serpens. A ring galaxy in which there is a central core of older yellow stars with a ring of young blue stars. The formation of a galaxy like this probably involves a galactic collision, but it's still a mystery. If you look closely at the gap, you can see another ring galaxy in the distance.(Credit: R. Lucas (STScI/AURA), Hubble Heritage Team, NASA) Mona Evans, "Cosmic Collisions"

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A nearly perfect ring of hot, blue stars pinwheels about the yellow nucleus of an unusual galaxy known as Hoag's Object. This image from NASA's Hubble Space Telescope captures a face-on view of the galaxy's ring of stars, revealing more detail than any existing photo of this object. The image may help astronomers unravel clues on how such strange objects form. Image: NASA and The Hubble Heritage Team (STScI/AURA) Acknowledgment: Ray A. Lucas (STScI/AURA)

A Strange Ring Galaxy: On the outside is a ring dominated by bright blue stars, while near the center lies a ball of much redder stars that are likely much older. Between the two is a gap that appears almost completely dark. How Hoag's Object formed remains unknown, although similar objects have been identified & collectively labeled as a form of ring galaxy. Genesis. Hypotheses include a galaxy collision billions of years ago & the gravitational effect of a central bar that has since vanished

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