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The Gravity Recovery and Interior Laboratory, or GRAIL, mission will come to an end at 5:28 p.m. EST Monday (Dec. 17) when the twin spacecraft crash into a mountain near the moon's north pole after nearly a year in lunar orbit.
A pair of robotic space probes circling the moon to reveal what is inside will make suicidal plunges to the lunar surface today, a planned -- albeit dramatic -- finale to a mission that is giving scientists new insights into how the solar system evolved.
The duo have been formation-flying to map the moon’s gravity, an innovative technique that has revealed a lunar crust that is thinner and far more deeply fractured than scientists expected and an extensive underground system of lava-filled cracks, the first direct evidence that the moon expanded after it was formed.
The GRAIL spacecraft, nicknamed Ebb and Flow, completed their primary mapping mission in May, flying about 34 miles above the lunar surface. By precisely and continuously measuring the distance between the two probes, scientists were able to map the moon’s gravity, revealing its interior structure. The distance changed slightly as the leading spacecraft and then the following one sped up or slowed down as they flew over denser or less-dense regions of the moon in response to the gravitational tugging.
The crash site was selected to avoid the possibility that the probes would crash into any artifacts left behind by the Apollo and other lunar missions.
The spacecraft will hit the surface at about 3,760 mph. No pictures are expected because the region will be in darkness at the time of impact.
Originally posted by EartOccupant
reply to post by NoExpert
I disagree with some of it..
Crashing those within sight would also be scientific interesting.
Crashing it out of sight seems a bit strange, or dumb.. A missed opportunity to learn more about the moon.
Unless of-course "they" can see (Another satellite, or other equipment) the impact, but don't want to share it with the other earthlings...
Conclusion: Either dumb.. Or a conspiracy! :-)
edit on 17-12-2012 by EartOccupant because: Spelling
Crashing it out of sight seems a bit strange, or dumb.. A missed opportunity to learn more about the moon.
Since Dec. 6, the GRAIL satellites, nicknamed Ebb and Flow, have moved even closer to the moon, flying at a mean altitude of less than 10 miles and buzzing just a few miles above the moon's highest peaks, according to Zuber.
The orbits of the GRAIL satellites are too unstable to keep the spacecraft flying without regular help from rocket thrusters. With the satellites low on propellant, the probes would impact the moon naturally, officials said.
Before impacting the moon Monday, the spacecraft will burn their rocket engines to empty their fuel tanks, an engineering experiment designed to refine techniques to estimate propellant quantities on satellites.
Or a conspiracy! :-)
Originally posted by EartOccupant
reply to post by NoExpert
Indeed I'm no expert ;-)
But I do know we have equipment to analyse the content and composition of things in the universe (gas clouds, atmospheres etc) from far far away, just by looking at them with camera's and other frequency analyzers..
It would not surprise me, they actually do not want to see (for instance China) or other organisations capable of such matters to be able to collect data from the impact, due to strategic, scientific..and at the and money and power reasons.
So I think I do understand.
Is it possible that they are destroying things before Branson and his pals get up there to have a look around?
Originally posted by Atzil321
100kg of foil, circuit boards and wires... Not realy an efficient weapon for destroying anything is it?