Most Mysterious Planets
The Top Ten
1 Uranus
Uranus is the seventh planet from the Sun in our solar system. It was discovered by William Herschel in 1781, making it the first planet to be discovered with a telescope. Unique among the planets, Uranus has an axial tilt of about 98 degrees, causing it to rotate on its side. Composed mainly of hydrogen, helium, and a small amount of methane, the planet is known for its pale blue color due to the methane in its atmosphere.
Uranus and Neptune were barely explored by a spacecraft (Voyager 2).
2 Planet X
How can this be a mysterious planet where it has not be discovered by our ground telescopes, nor even observed, I don't get it.
3 Neptune
4 Pluto
5 Makemake
6 Haumea
7 Saturn
Saturn is the 6th planet from the Sun, it is the second-largest and has the most moons. One year on Saturn is 29 Earth years (10,756 Earth days). Saturn is known for its rings. Saturn is a gas giant, so there is no solid surface on the planet. It is also almost 1 billion miles away from the Sun. The Cassini-Huygens spacecraft was sent to Saturn on October 15, 1997, and arrived at Saturn on July 1, 2004. Saturn was discovered in 1610 by Galileo Galilei.
8 Ceres
9 Earth
10 Eris
Eris is a dwarf planet located in the scattered disk, a region of the solar system beyond Neptune. It was discovered in 2005 by astronomer Mike Brown and his team, and its discovery led to a redefinition of what constitutes a planet, eventually resulting in the reclassification of Pluto as a dwarf planet. Eris is named after the Greek goddess of strife and discord. It is the ninth-largest object orbiting the Sun and has one known moon, Dysnomia.
The Contenders
11 Jupiter
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