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what's up 4 sep tember enjoy a tour of

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lunar landing sites as NASA's Grail

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mission launches to the moon this month

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hello and welcome I'm Jane Houston Jones

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at NASA's Jet Propulsion Laboratory in

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Pasadena California the moon is easily

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visible in everyone's night sky in the

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first part of September look for the

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areas where all six of the Apollo

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missions landed on the moon you won't

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see the Landers flag or footprints but

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it's fun and easy to see these historic

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areas with your own eyes or with

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binoculars on the 6th look for three

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dark smooth Marya or sees the middle one

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is the Sea of Tranquility or Mar a

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tranquil atortoise Apollo 11 landed very

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near a bright crater on the edge of the

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Samar a in 1969 the Apollo 15 16 and 17

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landing areas formed the points of a

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triangle above and below the Apollo 11

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site on the 7th you'll be able to see

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the bright crater Copernicus just below

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it are the landing sites of Apollo 12

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and 14 NASA's twin lunar probes Grail a

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and Grail be will launch on September

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eight Grail stands for Gravity Recovery

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and interior laboratory

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the two Grail spacecraft will be

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launched together and then we'll fly

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similar but separate trajectories to the

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moon after they separate from the launch

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vehicle it took astronauts about three

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days to get to the moon but the two

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Grail spacecraft will take more than

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three months and won't arrive until

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December 31st 2011 and january 1st 2012

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this longer flight path allows Grail to

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arrive with a lower velocity and reduces

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the amount of propellant needed to get

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the spacecraft into orbit around the

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moon the two spacecraft will orbit the

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moon in formation to determine the

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structure of the lunar interior from the

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moon's crust to its core each Grail

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spacecraft is about the size of a

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washing machine and they're not

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identical twins they have minor

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differences resulting from the need for

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Grail aid to follow grille be as they

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circle the moon this Gravity Recovery

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and interior laboratory mission will

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create the most accurate gravitational

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map of the moon to date accurate

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knowledge of how the moon's gravity

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varies from place to place will also be

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an invaluable navigational aid to future

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lunar spacecraft

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next month you can celebrate

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international observe the moon night on

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october eighth the moon will then appear

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exactly as it does on the 8th of this

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month you can read about gravity in the

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solar system at solar system NASA gov /

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y SS for year of the solar system you

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can learn about the Grail mission at

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Grail nasa gov and you can learn about

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all of NASA's missions at WWDC govt