The formation of the Earth-Moon system has long been theorized to have been heavily influenced by the impact of a Mars-sized celestial body, commonly called "Theia" by scientists. The Moon’s formation is theorized to have occurred when this object struck the primordial Earth, spinning off a portion of it’s mass, that formed into the Moon as we know it today. However, a common question has dogged the issue since it’s conception: did Theia just strike a glancing blow to the primordial Earth, or did it strike it head-on?
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With recent advances in imaging technology pushing the boundaries of astronomy and space exploration more rapidly than ever before, new discoveries within the solar system and beyond are now being made at a breakneck pace. Part of that exploration has been for the elusive Planet X, a theorized large trans-Neptunian world that has otherwise eluded attempts at detection. Until now, only smaller planetoids have been discovered in the deep dark of space, but two new findings hold promise as new candidates for the title of Planet X.
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Researchers at Harvard University are excited about what may be the biggest discovery yet made in the field of exoplanets, with University of Maryland astronomer Drake Deming calling it "arguably the most important planet ever found outside the solar system."
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Astronomers have identified a star system just 22 light years from Earth with three planets that could potentially harbor life. The Gliese star system is easy to locate in the constellation Scorpius. The two main stars, Gliese 667A and B, are visible to the naked eye, but the one with the planets, Gliese 667C, requires a telescope to see. Gliese 667C has 7 planets, and 3 of them are in its habitable zone, which is the region around the star where temperatures would not be too high or too low for life to form, and where water would be a liquid. Earth is near the center of the sun’s habitable zone, and Venus and Mars are at its extremes. 
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