A mission of placing a pair of probes around Earth’s satellite Moon is entering a new stage. NASA announced that mission controller are preparing two same spaceshops Grail-A and Grail-B, to enter the satelite’s orbit on New Years Eve.
These probes are on a mission to measure the uneven gravity field NASA’s twin lunar Gravity Recovery and Interior Laboratory (GRAIL) probes were launched on September 10, 2011 from the Florida coast in September.
GRAIL-A will enter in lunar orbit on December 31 and one they later the GRAIL-B will join it’s twin spaceship.
These to probes will spend two months around the Moon and the scientists on the Earth will make the measurements of the varying distance between the pair of spaceships to calculate the lunar gravity field.
“Both spacecraft have performed essentially flawlessly since launch, but one can never take anything for granted in this business,” said mission chief scientist Maria Zuber.
A distance between the Earth to the Moon is about 250,000 miles.
“I know I’m going to be nervous. I’m definitely a worrywart,” said project manager David Lehman of NASA’s Jet Propulsion Laboratory. He is on the head of this $496 million mission.
The main aim of this mission is the get measurements on the Moon’s gravity, while the probes circle the moon, changes in the lunar gravity field will cause them to change their speed.
This mission will allow scientists to make more detail research of the Moon and better understand that white circle on the sky that follow us around.
After we reached the Moon and walked on it, it is the time to get to know it better.