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The Discovery of a Planet, Part 3: Planet X

Posted by Amir Alexander on 2005/02/14 11:00 CST

The discovery of Neptune accounted for nearly all the unexplained motions of the outer planets of the Solar System. Nevertheless, several astronomers insisted that some unexplained residual motions remained, pointing to the presence of a ninth planet beyond the orbit of Neptune.

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The Discovery of a Planet, Part 2: Out of the Six-Planet World

Posted by Amir Alexander on 2005/02/13 11:00 CST

Since humans first set their eyes to the stars, they noticed that a few of these bright objects behaved differently from the others. Whereas all the stars moved together, revolving around the Earth once every 24 hours, five appeared to move within the firmament among the other stars. Accordingly, they were named “planets,” meaning “wanderers” in Greek.

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The Discovery of a Planet, Part 1: The Blinking Image

Posted by Amir Alexander on 2005/02/12 11:00 CST

February 18, 1930, was a cloudy day at the Lowell Observatory, on top of Mars Hill in Flagstaff, Arizona. 22 year old Clyde Tombaugh was hard at work, peering through the lens of an ancient-looking brass-colored device. The instrument, known as a “blink comparator,” mounted two large photographic plates.

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The Stories Behind the Voyager Mission: Jurrie van der Woude

Posted by A.J.S. Rayl on 2002/09/05 12:00 CDT

Jurrie van der Woude worked for 25 years in the Jet Propulsion's Laboratory's Public Affairs Office as Image Coordinator. It was Jurrie who, working closely with the Voyager imaging team, chose the best images to release to the press.

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The Stories Behind the Voyager Mission: Bud Schurmeier

Posted by A.J.S. Rayl on 2002/09/05 12:00 CDT

Harris 'Bud' Schurmeier served as the first Project Manager for the Voyager mission. In 1976, just before the twin spacecraft launched, he became Assistant Lab Director at the Jet Propulsion Laboratory (JPL).

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The Stories Behind the Voyager Mission: Charles Kohlhase

Posted by A.J.S. Rayl on 2002/09/05 12:00 CDT

Charles Kohlhase served as Mission Design Manager for Voyager from 1974 to 1989. He brought more than a decade's worth of experience working on the Mariner and Viking missions to the position.

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The Stories Behind the Voyager Mission: Linda Morabito Kelly

Posted by A.J.S. Rayl on 2002/09/05 12:00 CDT

Linda Morabito Kelly began working at Jet Propulsion Laboratories while still a student at the University of Southern California. In 1974, she accepted a fulltime position as an engineer in the Satellite Ephemeris Development and Orbit Determination section JPL.

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The Stories Behind the Voyager Mission: Bruce Murray

Posted by A.J.S. Rayl on 2002/09/05 12:00 CDT

Bruce C. Murray served as the only geologist on the team planning the Grand Tour, which was cancelled by NASA in 1972, but which led to Voyager the same year. He later became the Director of the Jet Propulsion Laboratory (JPL), a position he held from 1976 to 1982, the early glory years of the mission.

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The Stories Behind the Voyager Mission: Ed Stone

Posted by A.J.S. Rayl on 2002/09/05 12:00 CDT

Edward C. Stone, an internationally renowned physicist, signed on as Project Scientist of the Voyager mission in 1972, responsible for coordinating the efforts of 11 teams of researchers.

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