Astronomers Shed Light on Quaoar's Astonishing Ring System
ESAAstronomers using ESA's Cheops space telescope discovered a ring system around Quaoar, a distant dwarf planet orbiting beyond Neptune, at a surprising location far outside the body's Roche limit. The Roche limit marks the boundary within which tidal forces should keep material from clumping into a moon, so finding a dense ring well past it, at roughly 7.5 times Quaoar's radius, overturns long held assumptions.
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