Astronomers say moon called Hippocamp is 21 miles across and moves at 20,000mph

Astronomers have described a miniature moon of Neptune that whizzes around the planet at breakneck speed.

The speck of a moon, no more than 21 miles across, hurtles around the distant gas giant at about 20,000 miles per hour, 10 times faster than our own moon circles Earth.

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