M
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W
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I
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V
X
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J
I
Z
Y
G
N
U
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E
B
H
U
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E
Q
B
M
V
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A
I
B
D
P
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L
P
C
Y
C
R
K
H
P
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C
U
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A
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Words

Found

Full-disc view of Pluto in near-true color, imaged by New Horizons

Pluto

Pluto was discovered by Clyde Tombaugh in 1930, and was originally considered the ninth planet from the Sun. After 1992, its planethood was questioned following the discovery of several objects of similar size in the Kuiper belt. In 2005, Eris, which is 27% more massive than Pluto, was discovered, which led the International Astronomical Union (IAU) to define the term "planet" formally for the first time the following year. This definition excluded Pluto and reclassified it as a member of the new "dwarf planet" category.

Wikipedia: Pluto

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