The Earth-Moon orbit, Saturn, OGLE-TR-122b, Jupiter, and other objects, to scale.
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The smallest and most abundant stars in the galaxy are red dwarfs. These M and K class stars can range in size from 0.08 to 0.50 solar radii. The smallest observed so far is OGLE-TR-122b at 0.12 solar radii.

Learn about OGLE-TR-122b.