Photo Moment: Telescope Hubble sees 'wheel within wheel'
A stellar "wheel within a wheel" is how one astronomer described it.
It is an unusual galaxy called Hoag's Object. The Hubble view of the galaxy is the most detailed image ever obtained of this object. It may help astronomers unravel how such strange objects form.
The entire galaxy is about 120,000 light-years wide, slightly larger than our Milky Way Galaxy.
The blue ring - which is dominated by clusters of young, massive stars - contrasts sharply with the yellow nucleus of mostly older stars.
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