This Asteroid May Be Three Worlds Fused Together

Astronomers may have discovered a rare contact trinary in the asteroid belt: asteroid 44 Nysa appears to be three distinct bodies fused together.

High-resolution observations reveal a striking three-lobed shape, while a tiny moon orbiting Nysa is helping scientists measure its mass and density. The findings could reveal whether Nysa is solid rock or a rubble pile—and how the earliest planetary bodies formed.

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