Dec 14, 2012

Dwayne Brown Headquarters, Washington 202-358-1726 dwayne c brown@nasa gov

D C Agle Jet Propulsion Laboratory, Pasadena, Calif 818-393-9011 agle@jpl nasa gov

Sarah McDonnell Massachusetts Institute of Technology, Cambridge 617-253-8923 s_mcd@mit edu

MEDIA ADVISORY: M12-240

NASA TO PROVIDE DEC 17 COMMENTARY AS TWIN PROBES END LUNAR MISSION

PASADENA, Calif -- NASA will provide live commentary of the scheduled lunar surface impacts of its twin Gravity Recovery and Interior Laboratory (GRAIL) spacecraft beginning at 2 p m PST (5 p m EST) Monday, Dec 17 The event will be broadcast on NASA Television and streamed on the agency's website

The two probes will hit a mountain near the lunar north pole at approximately 2:28 p m Monday, bringing their successful prime and extended science missions to an end

Commentary will originate from the control room at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif Coverage will last about 35 minutes and include live interviews with GRAIL team members GRAIL's final resting place on the moon will be in shadow at the time of impact, so no video documentation of the impacts is expected

Data from the GRAIL twins are allowing scientists to learn about the moon's internal structure and composition in unprecedented detail The two probes are being sent purposely into the moon because they do not have enough altitude or fuel to continue science operations Media wishing to cover the end of the GRAIL mission at JPL, where they will have the opportunity to conduct interviews and watch a live feed from mission control, must contact the JPL Media Relations Office at 818-354-5011 by 11 a m Dec 17 Valid media credentials are required Non-U S citizens also must present valid passports

For NASA TV streaming video, schedule and downlink information, visit:

http://www nasa gov/ntv

The coverage will also be streamed live on Ustream at:

http://www ustream tv/nasajpl2

Join the conversation on Twitter by following the hashtag #GRAIL To learn more about all the ways to connect and collaborate with NASA, visit:

http://www nasa gov/connect

For the mission's press kit and other information about GRAIL, visit:

http://www nasa gov/grail

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