ความคิดเห็นที่ 61
Planet X disproved
Harrington died in January 1993, without having found Planet X.[39] Six months before, Myles Standish used data from Voyager 2's 1989 flyby of Neptune, which had revised the planet's total mass downward by 0.5%—an amount comparable to the mass of Mars[39]—to recalculate its gravitational effect on Uranus.[40] When Neptune's newly determined mass was used in the Jet Propulsion Laboratory Developmental Ephemeris (JPL DE), the supposed discrepancies in the Uranian orbit, and with them the need for a Planet X, vanished.[3] Moreover, there are no discrepancies in the trajectories of any space probes such as Pioneer 10, Pioneer 11, Voyager 1 and Voyager 2 that can be attributed to the gravitational pull of a large undiscovered object in the outer Solar System.[41] Today, most astronomers agree that Planet X, as Lowell defined it, does not exist
http://en.wikipedia.org/wiki/Planet_X#Planet_X
จากคุณ :
pendulum swings
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2 ก.ค. 52 09:59:37
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