Charles Q. Choi is a contributing writer for Space.com and Live Science. He covers all things human origins and astronomy as well as physics, animals and general science topics. Charles has a Master of Arts degree from the University of Missouri-Columbia, School of Journalism and a Bachelor of Arts degree from the University of South Florida.
Jam packed issues filled with the latest cutting-edge research, technology and theories delivered in an entertaining and visually stunning way, aiming to educate and inspire readers of all agesEarth's moon is thought to have formed when a Mars-sized object, called Theia, slammed into the proto-Earth more than 4.4 billion years ago, blasting out material that later coalesced into a large satellite as depicted in this artist's illustration.
In the new study, the researchers examined the ways in which the gravitational pull of debris from the impact that formed the moon could help explain how the moon's orbit changed over time.
The scientists found the Earth-moon system could have once fostered a companion or a disk around itself in a polar orbit — ones that revolved around the poles of Earth and the moon, instead of around their equators. Although there are no stable polar circumbinary orbits around Earth and the moon in the present day, they discovered such orbits were stable immediately up to the formation of the moon, up until the distance between Earth and the moon reached a distance of about 7.
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