Friday, December 30, 2011

NASA Blast Off To the Moon

NASA probes may find remnants of moon's lost sibling

It has been more than forty years since man has been to the moon and now there seems to be a particular fascination with it. This fascination is being shared by the Americans, Russians, Chinese and the Indians. What is causing this sudden interest and why aren't these countries pooling their technological and financial resources. It almost appears that whatever is there these countries want to claim as their own. It makes little sense but it does warrant keeping an eye on the peculiar space race. 

Two identical NASA space probes are due to arrive at the moon this weekend to learn what is inside Earth's companion and how it formed.

Among the most interesting questions scientists will attempt to answer is if our moon holds the wrecked body of a lost sibling body.
Evidence of the crash, if it occurred, should be buried inside the moon, in the form of remnant radioactive materials, like uranium and thorium, which would have been heated in the smash-up.

NEWS: Earth Must Have Another Moon, Say Astronomers

According to a recently published paper, scientists suspect a second moon once circled Earth in the same orbit and at roughly the same speed as our moon. It eventually bumped into its companion, but instead of causing an impact crater, the second moon stuck and made a mountain. That feature today would be the lunar highlands located on the side of the moon that permanently faces away from Earth.

"One prediction of this model is that the whole exterior of the moon was once molten, and it started to cool off — actually cooled from the outside in — so you were left with a molten channel in the base of the moon's crust," said Maria Zuber, a planetary scientist at the Massachusetts Institute of Technology.

Simulations show that when the second moon hit our moon, the molten material was pushed around to the near side, traces of which should remain today.

"We're looking for layering in the lower crust," said Zuber, who is the lead researcher on NASA's Gravity Recovery and Interior Laboratory mission. The $496 mission is also known by its acronym, Grail.

ANALYSIS: Could Galactic Cataclysms Be Recorded on the Moon?

Flying in formation 34 miles above the lunar surface, the two Grail spacecraft will map the moon's gravity down to fractions of a micron. A micron is about thewidth of red blood cells.

VIDEO: NASA smashes LCROSS and spent Centaur rocket into moon in search of water.
Scientists can use the precise measurements to model the moon's interior, a key piece of data missing despite more than 100 previous missions to the moon, including excursions made by NASA astronauts during the six Apollo moon landings between 1969 and 1972.

"We believe the moon formed from the impact of a Mars-sized object with Earth, but we understand little really of how this formation happened and how it cooled off after the violent event," Zuber said.

"One fundamental thing that we don't know about the moon — shockingly after all these missions that have gone to the moon — is why the near side of the moon is different than the far side," she added.

NEWS: Earth May Have Swirled Moon's Core

Grail-A is due to begin a 40-minute braking maneuver to put itself into orbit around the moon at 4:21 p.m. ET on Saturday. Grail-B arrives 25 hours later on New Year's Day.

Both spacecraft are needed to complete the mapping mission, which is scheduled to last 82 days.

"We won't be celebrating a lot until after we get Grail-B into orbit," said projectmanager David Lehman, with NASA’s Jet Propulsion Laboratory in Pasadena, Calif.

It will take two months for the spacecraft to move themselves from their initial lunar orbits into position to begin mapping. If the battery-powered probes survive the nextlunar eclipse, scientists want to move them even closer to the moon for a follow-on mission that would provide even more precise measurements.
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