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Young Earth saw different face of moon

by Anadolu Agency

SAN FRANCISCO Mar 25, 2016 - 12:00 am GMT+3
by Anadolu Agency Mar 25, 2016 12:00 am
The moon spun on a different axis and the early Earth saw a different side of the satellite's face billions of years ago, according to a study published Wednesday. The research, which used data collected by NASA's Lunar Prospector spacecraft in the late 1990s, claims that the moon used to spin at a completely different angle compared to its current position. A series of volcanic explosions about 3 billion years ago caused the moon's north and south poles to move. Researchers claim Earth's satellite shifted approximately 6 degrees to its current axis, or roughly 201 kilometers. The move means the Earth witnessed a different side of the moon during its infancy. Essentially, the moon's polar shift would be like if the Earth's North Pole moved to Greenland, the astronomers claim. The discovery also means that a large proportion of the frozen water at the moon's poles was formed before the axis shift and likely dates to the early days of the solar system - an estimated 4.6 billion years ago. If a space agency sent a rover or astronauts to the lunar poles, collection there would be a sampling of some of the oldest water in the known universe, researchers believe. "This was such a surprising discovery," said study author Matt Siegler, a planetary scientist at Southern Methodist University in Dallas, Texas. The moon's polar ice is now extremely tantalizing for scientists since it likely provides insight into the solar system's early days. Researchers believe it holds clues to the ancient source of water for the moon and the Earth. The study was published Wednesday in the journal Nature.
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