Holy GRAIL! Photos From NASA's Moon Gravity Mission

GRAIL's Delta 2 Rocket Second Stage

Workers using an overhead crane lower the second stage of a Delta II launch vehicle toward the first stage for mating at NASA's Space Launch Complex 17B in Florida, on May 10, 2011. The payload fairing then will be raised into the white room of the mobile service tower. This rocket will launch NASA's twin GRAIL spacecraft.

First Stage of GRAIL's Delta 2 Rocket

At Cape Canaveral Air Force Station's Space Launch Complex 17B, solid-fueled boosters are prepared for attachment to the first stage of the Delta II rocket that will launch the GRAIL twin spacecraft.

GRAIL's Logo

NASA's Gravity Recovery and Interior Laboratory, or GRAIL, spacecraft logo is emblazoned on the first stage of a United Launch Alliance Delta II launch vehicle, now secured in the gantry at Cape Canaveral Air Force Station's Space Launch Complex 17B.

GRAIL'S Delta 2 First Stage Horizontal

The first stage of a United Launch Alliance Delta II rocket has arrived at Space Launch Complex 17B at Cape Canaveral Air Force Station in Florida on April 7, 2011. The Delta II will be stacked at the launch pad and eventually topped by the payload fairing containing NASA's Gravity Recovery and Interior Laboratory, or GRAIL, spacecraft.

GRAIL'S Delta 2 First Stage

Workers at Cape Canaveral Air Force Station's Space Launch Complex 17B monitor the progress as the first stage of a United Launch Alliance Delta II rocket is lifted into the gantry, April 7, 2011.

NASA's Gravity Recovery and Interior Laboratory (GRAIL) Spacecraft

NASA's Gravity Recovery and Interior Laboratory (GRAIL) spacecraft will launch on a Delta 2 rocket from the Cape Canaveral Air Force Station in Florida.

GRAIL Spacecraft Lifted

NASA hoists the twin Gravity Recovery and Interior Laboratory (GRAIL) spacecraft to the top of their launch pad at Space Launch Complex 17B at Cape Canaveral Air Force Station in Florida.

GRAIL Payload Fairing Added to Booster

The payload fairing is added to the GRAIL booster.

The Quest for the Lunar GRAIL

The Gravity Recovery and Interior Laboratory, or Grail, mission will fly twin spacecraft in tandem orbits around the moon to measure its gravity field in unprecedented detail.

Grail Mission - Spath

Man with a mission…to the moon. Stuart Spath, chief engineer for NASA’s Gravity Recovery and Interior Laboratory (GRAIL) at Lockheed Martin Space Systems, holds small models of the GRAIL twosome.