14 April 2013, 07:00 AM ET
It may only cost you $500 million to get to the moon, instead of the originally advertised $750 million.
11 April 2013, 07:00 AM ET
The REAL Space Act would help safeguard American leadership in space, its sponsors say.
22 March 2013, 07:35 PM ET
The engines will be cleaned up and put on public display.
19 March 2013, 03:31 PM ET
NASA's Lunar Reconnaissance Orbiter has photographed the tiny craters made by the Grail moon probes.
14 January 2013, 05:17 PM ET
NASA's Ebb spacecraft recorded the video three days before crashing into the lunar surface.
18 December 2012, 10:41 AM ET
The engineers who built NASA's Grail spacecraft gathered to watch the probes' demise.
17 December 2012, 06:32 PM ET
Ride had led Grail's MoonKAM project, which allowed kids to choose sites for the spacecraft to photograph.
17 December 2012, 05:28 PM ET
Ebb and Flow wrapped up their successful science mission in spectacular fashion.
17 December 2012, 06:00 AM ET
NASA TV will provide commentary, but the impact itself will probably not be visible.
13 December 2012, 01:33 PM ET
The Grail spacecraft will go out in style on Dec. 17.
11 December 2012, 10:51 AM ET
The Grail spacecraft will go out in style Dec. 17.
05 December 2012, 02:20 PM ET
The findings should shed light on the evolution of the moon and the solar system's rocky planets.
07 November 2012, 02:21 PM ET
The space agency has likely been holding off until the presidential election was decided.
08 October 2012, 06:58 AM ET
The proposed project is a joint effort of Europe and Russia.
22 March 2012, 04:45 PM ET
The Messenger spacecraft began a one-year bonus mission at Mercury, and the twin Grail probes will get 90 more days at the moon.
22 March 2012, 03:26 PM ET
The MoonKAM project is an educational outreach program for middle school students.
07 March 2012, 02:05 PM ET
The Grail probes' measurements should help scientists learn about the moon's structure and evolution.
01 February 2012, 04:58 PM ET
NASA's Grail probes have returned their first view of the far side of the moon.
19 January 2012, 07:01 AM ET
NASA's Grail spacecraft will begin mapping the moon in early March
17 January 2012, 01:10 PM ET
The names were suggested by students competing in a nationwide NASA contest.
17 January 2012, 09:45 AM ET
The new names for the twin Grail moon probes were selected from a nationwide student contest.
08 January 2012, 08:00 AM ET
From New Year's resolutions to private spaceflight, vote for your top space story of the week.
01 January 2012, 05:05 PM ET
The Grail-A spacecraft is orbiting the moon, and its twin Grail-B has joined it today.
01 January 2012, 12:33 PM ET
From New Year's moon mission to a supernova space oddity. vote for your top space story of the week.
31 December 2011, 11:46 PM ET
NASA's twin Grail gravity-mapping probes
31 December 2011, 04:22 PM ET
The Grail-A spacecraft was captured by the moon's gravity on Saturday afternoon.
31 December 2011, 12:58 AM ET
NASA's Grail mission will map the moon's gravity like never before.
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.