22 December 2015

After 40 Years, New Results From The Moon's Surface

Article re posted from http://www.popsci.com/after-40-years-new-results-from-moons-surface

Back in 2013, Chinese lunar lander Chang'e 3 visited the moon, carrying with it a rover named Yutu, or 'Jade Rabbit'. Now, two years later, the first scientific results from Yutu have been published.

In a paper published in Nature Communications an international team of researchers examined some of the first results from the Chang'e 3 mission.

The moon rocks examined by Yutu were relatively young compared to the rocks analyzed by previous missions, including the crewed American Apollo missions and the un-crewed Soviet Luna missions back in the 1970's. The rocks examined by Yutu were a mere 2.96 billion years old as opposed to the 3-4 billion year old rocks found on the Apollo missions.

Like the rocks found on other areas of the moon, the rocks examined by Yutu were basalts, rocks formed by volcanic activity a very long time ago.

Scientists think that the moon was a seething magma ocean about 4 billion years ago, soon after a giant moon-forming object slammed into the Earth. As it cooled down, parts of the magma ocean separated, with some parts sinking, and other, lighter parts of the ocean floating to the top. Periodically, heating from the center of the moon (hot with radiation) would force some material up, creating huge volcanic explosions, and leaving lava flows that became the Mares or 'seas' of the moon (the dark spots you see when you look at it).

Researchers looking at the Chang'e landing site from orbit noticed that they were seeing strange rocks mixed together, but hadn't been able to verify their observations with actual samples. Now they can, and the research is opening up new windows into the composition of the Moon's surface.

"We now have 'ground truth' for our remote sensing, a well-characterized sample in a key location," Bradley Jolliff, a planetary scientist who studied the rover results, said. "We see the same signal from orbit in other places, so we now know that those other places probably have similar basalts."

Other missions to the moon are already underway. Two companies, SpaceIL and Moon Express, have already booked passage to the moon sometime before December 31, 2017, both hoping to win the Google Lunar X-prize. By 2020, China hopes to be the first to send a lander to the dark side of the moon. Russia and Europe have plans for a joint mission to the lunar pole by 2020, with Russia pushing for a crewed mission by 2029.

Next stop: moon colonies.



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