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WHAT’S MY AGE AGAIN?  The moon formed about 4.51 billion years ago, a new analysis of lunar rocks reveals.


MINI MOONS  The moon may have been formed by a series of medium to large impacts that created mini moons that merged, rather than from a single colossal impact.

hydrogen on ceres

ICY REALMS  Dwarf planet Ceres has more hydrogen beneath its surface near the poles, indicating a subsurface layer of ice mixed in with the rock. Blue shows where the hydrogen abundance is highest.

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