New moon discovered circling Neptune spotlights solar system’s violent pastSay hello to Hippocamp,a celestial pipsqueak that’s making astronomical waves at the edge of our solar system. With aid from NASA’s Hubble Space Telescope, astronomers have confirmed the existence of this tiny moon in orbit around Neptune. The newly characterized moon — named after a mythical half-horse, or half-fish sea creature — is the smallest moon yet discovered in orbit around the outermost planet. NASA says the 20-mile-wide moon is about 100 million times fainter than the faintest star that’s visible to the bare eyeRead more.
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