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It was the first Kuiper belt object to be discovered. 2006, during their 26th General Assembly. That definition excluded Pluto and reclassified it as a dwarf planet. It is the largest known trans-Neptunian object by volume but is less massive than Eris.
Neptune prevents them from colliding. Light from the Sun takes about 5. The same area of night sky with stars, shown twice, side by side. One of the bright points, located with an arrow, changes position between the two images. Subsequent observations of Neptune in the late 19th century led astronomers to speculate that Uranus’s orbit was being disturbed by another planet besides Neptune.
Lowell and his observatory conducted his search until his death in 1916, but to no avail. Unknown to Lowell, his surveys had captured two faint images of Pluto on March 19 and April 7, 1915, but they were not recognized for what they were. Percival’s widow, Constance Lowell, entered into a ten-year legal battle with the Lowell Observatory over her husband’s legacy, and the search for Planet X did not resume until 1929. Slipher had been impressed by a sample of his astronomical drawings.
Tombaugh’s task was to systematically image the night sky in pairs of photographs, then examine each pair and determine whether any objects had shifted position. On February 18, 1930, after nearly a year of searching, Tombaugh discovered a possible moving object on photographic plates taken on January 23 and 29. A lesser-quality photograph taken on January 21 helped confirm the movement. The discovery made headlines around the globe. Lowell Observatory, which had the right to name the new object, received more than 1,000 suggestions from all over the world, ranging from Atlas to Zymal. Tombaugh urged Slipher to suggest a name for the new object quickly before someone else did. The name was announced on May 1, 1930.