The study analyzed data brought by the NASA Gravity Recovery and Interior Laboratory (GRAIL) mission, which proves the speculation to be true. The GRAIL mission had two spacecraft orbit the moon ...

The finding could explain the long-running mystery of why the surfaces of the lunar near and far sides are so different.

NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission has uncovered the origin of massive invisible regions that make the Moon’s gravity uneven, a phenomenon that affects the ...

A Delta 2 Heavy rocket propels NASA's twin Gravity Recovery and Interior Laboratory (GRAIL) mission into the clouds over Cape Canaveral Air Force Station in Florida. The spacecraft launched at 9: ...

The data from the U.S. space agency's GRAIL, or Gravity Recovery and Interior Laboratory, mission indicates that the moon's deep interior has an asymmetrical structure, apparently caused by ...

Data from NASA’s twin Gravity Recovery and Interior Laboratory (GRAIL) probes has been used to create the highest resolution gravity map yet of any body in the Solar System. The two washing ...

The twin spacecraft, named Ebb and Flow, are shown being assembled in Colorado under NASA's Gravity Recovery and Interior Laboratory program. The twin spacecraft, named Ebb and Flow, are shown ...

In 2012, NASA rang in the New Year with a fresh mission — sending the Gravity Recovery And Interior Laboratory, also known as GRAIL, spacecraft to the moon. As the first endeavor intended to ...

Near-identical twins Grail-A and Grail-B -- short for Gravity Recovery and Interior Laboratory-- are due to blast off Thursday aboard an unmanned rocket. Although launched together, the two ...