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→Discovery
== Discovery ==
== Discovery ==
Pluto was discovered by [[Clyde W. Tombaugh]] on February 18, 1930 at the Lowell Observatory in Flagstaff, Arizona. Tombaugh was searching for "Planet X," a planet beyond [[Neptune]] that was believed to be influencing Neptune's orbit. Percival Lowell had calculated possible positions for Planet X based on observations of Neptune's orbit. However, Tombaugh did not make use of Lowell's calculations. Instead, he used the observatory's telescope to photograph the opposition point to the sun for a year, thus conducting a full sky survey of the Zodiac. Tombaugh's daughter Annette proposed the name of that object: Pluto.
Pluto was discovered by [[Clyde W. Tombaugh]] on February 18, 1930 at the Lowell Observatory in Flagstaff, Arizona. Tombaugh was searching for "Planet X," a planet beyond [[Neptune]] that was believed to be influencing Neptune's orbit. Percival Lowell had calculated possible positions for Planet X based on observations of Neptune's orbit. However, Tombaugh did not make use of Lowell's calculations. Instead, he used the observatory's telescope to photograph the opposition point to the sun every night for a year, thus conducting a full sky survey of the Zodiac. Tombaugh's daughter Annette proposed the name of that object: Pluto.
When astronomers realized that Pluto is not large enough to influence Neptune's orbit, the search for Planet X was resumed. It continued until 1989, when [[Voyager 2]] flew by [[Neptune]]. NASA scientists determine that Neptune was significantly heavier than previously supposed, invalidating earlier orbital calculations.
When astronomers realized that Pluto is not large enough to influence Neptune's orbit, the search for Planet X was resumed. The idea of Planet X was debunked in 1989, when [[Voyager 2]] flew by [[Neptune]]. NASA scientists determined that Neptune was significantly heavier than previously supposed, invalidating the earlier orbital calculations by Lowell and others.
== The dwarf planet controversy ==
== The dwarf planet controversy ==