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article imageNASA twin space craft makes final approach for Moon orbit

By Joe Gullo     Dec 28, 2011 in Science
3-2-1...NASA’s twin spacecraft called Gravity Recovery and Interior Laboratory (GRAIL) (GRAIL-A and GRAIL-B) are inching closer to the moon's orbit.
Traveling 250,000 miles, GRAIL-A will arrive in orbit on New Year's Eve and GRAIL-B will arrive New Year's Day.
The spacecraft, according to, “will spend the next two months tweaking their positions before they start collecting data in March."
The spacecraft will capture the moons orbit through radio signals which will map the moon's gravitational field.
This will help scientists understand what is going on below the surface NASA says.
The mission has been ongoing for approximately the past 100 days. says, the data should allow scientists to "draw insights about how the rocky body formed and how it has changed over time."
GRAIL-A was launched on September 30 and GRAIL-B was launched October 5. NASA says the reason the two spacecraft weren't launched together was because they wanted to stagger the arrival time and approach to the moon.
More about NASA, Moon, Nasa Moon Orbit
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