We have grown quite accustomed to what has been taught during our school days that Pluto is the ninth and the last planet of the solar system. Discovered in 1930, Pluto had been considered as a planet ever since. That is, until the International Astronomical Union (IAU) crossed out Pluto as a planet in 2006, downgrading it instead to a dwarf planet. Officials argued that although Pluto orbits around the sun and has a spherical shape, it’s not otherwise not large enough to qualify as a “true” planet.
But eight years later, Pluto became a hot topic again. It’s because Pluto may have a good chance to reclaim its old status as a planet. In July 2015 a NASA space probe New Horizon flew by Pluto to take detailed images and measurements of the dwarf planet.