30 December 2011, 06:32 PM ET
See photos of NASA's Grail moon twins, two spacecraft to map the lunar gravity like never before.
30 December 2011, 07:00 AM ET
The Grail spacecraft will start orbiting Earth's nearest neighbor on New Year's Eve and Day.
28 December 2011, 03:09 PM ET
The Grail spacecraft will enter orbit around Earth's nearest neighbor on Saturday and Sunday.
04 October 2011, 06:00 AM ET
Not satisfied with the name GRAIL, NASA is inviting kids to offer up a better name for the mission.
10 September 2011, 09:08 AM ET
NASA's Grail mission will study the inside of the moon and its gravitational field.
10 September 2011, 08:21 AM ET
High-altitude winds have once again delayed the launch of NASA's Grail mission.
10 September 2011, 12:14 AM ET
NASA will try launching its twin Grail lunar probes again tomorrow, after delays.
08 September 2011, 11:43 PM ET
The delay is the second in two days and allows time to study propulsion system data.
08 September 2011, 08:30 AM ET
Windy weather has delayed the launch of the twin Grail spacecraft on NASA's mission to map the moon's gravity.
08 September 2011, 12:19 AM ET
Students and teachers can follow along with NASA's Grail mission to investigate the moon's gravity fields.
07 September 2011, 06:09 PM ET
NASA's twin Grail lunar probes are slated to launch Sept. 8 on a mission to map the moon's gravity.
07 September 2011, 07:00 AM ET
Grail will map the moon's gravity field up to 1,000 times better than previous missions, researchers say.
06 September 2011, 03:15 PM ET
Clouds and thunderstorms may scrub the launch, but the forecast should improve over the weekend.
05 September 2011, 08:00 AM ET
The GRAIL mission will send two spacecraft to study the moon's structure.
01 September 2011, 07:00 AM ET
The GRAIL moon-studying mission blasts off on Sept. 8.
26 August 2011, 09:30 AM ET
The Gravity Recovery and Interior Laboratory (GRAIL) will use twin spacecrafts flying in tandem to study the gravity of the moon in unprecedented detail. Set to launch on September 8, 2011.
25 August 2011, 02:06 PM ET
The launch of NASA's GRAIL moon-studying spacecraft should go off as planned Sept. 8.
13 June 2008, 03:30 AM ET
NASA spacesuits get new maker and look for lunar missions.
21 February 2008, 02:01 PM ET
Google and the X PRIZE Foundation unveil a new partnership, new teams and more prize money.
11 December 2007, 12:51 PM ET
NASA selects new moon mission to peek at lunar interior.
04 December 2007, 07:00 AM ET
Remastered moon photos 40 provide invaluable moon mission information.
21 November 2005, 11:55 AM ET
21st century Moon operation -- private-sector style -- has been blueprinted by SpaceDev.
13 April 2000, 06:27 AM ET
All you had to do was hear Jim Lovell's voice and you knew it was something bad. Apollo 13 was in trouble.