Solar System Planets: Order of the 8 (or 9) Planets

Ever for the reason that of Pluto in 1930, children grew up studying that the photo voltaic system has 9 planets. That every one modified within the late 1990s, when astronomers began arguing about whether or not Pluto was certainly a planet. In a extremely controversial determination, the Worldwide Astronomical Union in the end determined in 2006 to designate Pluto as a “dwarf planet,” decreasing the record of the photo voltaic system’s true planets to only eight. 

Astronomers, nonetheless, are nonetheless trying to find one other attainable planet in our photo voltaic system, a ninth planet, after mathematical proof of its existence was revealed on Jan. 20, 2016. The alleged “Planet 9,” additionally referred to as “Planet X,” is believed to be about 10 instances the mass of Earth and 5,000 instances the mass of Pluto. 

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