The man in the moon is about to have his innards' scanned. NASA has launched two probes that will study the moon's internal structure in unprecedented detail, shedding light on whether a second moon crashed into it long ago.
The probes, together called GRAIL (Gravity Recovery and Interior Laboratory), lifted off on Saturday at 0908 EDT from Cape Canaveral Air Force Station in Florida. Lift-off was originally set for 8 September but was postponed due to high winds.
After they reach the moon in about four months' time, the probes will measure slight variations in the strength of the moon's gravity, which isn't uniform due to the uneven distribution of matter inside it.
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