NASA's twin GRAIL (Gravity Recovery and Interior Laboratory) spacecraft have spent the last year mapping the moon's hidden heart. Today at 4:28 p.m. CST they'll be intentionally crashed into a ...

Two NASA moon probes will end their gravity-mapping mission in spectacular fashion on Monday, crashing intentionally into a cliff near the lunar north pole. The twin Grail spacecraft, known as Ebb and ...

Two NASA moon probes will end their gravity-mapping mission in spectacular fashion Monday (Dec. 17), crashing intentionally into a cliff near the lunar north pole. The twin Grail spacecraft, known as ...

A NASA mission to study the Moon from crust to core has completed its prime mission earlier than expected. The team of NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission, with twin probes ...

LOS ANGELES (AP) - Ebb and Flow chased each other around the moon for nearly a year, peering into the interior. With dwindling fuel supplies, the twin NASA spacecraft are ready for a dramatic finish.