Do you know why Pluto is kept out of the Planet System of Sun ?
Since its discovery in 1930, Pluto has been a bit of a puzzle. It’s smaller than any other planet – even smaller than the Earth’s moon.
It is so small that surface area of Russia is more than surface area of Pluto.
On August 24, 2006, the International Astronomical Union (IAU), an organization of professional astronomers, revoked Pluto’s planetary status.
Now objects in orbit around our sun are :
Planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Dwarf planets: Pluto, Ceres (an object in the asteroid belt between Mars and Jupiter), 2003 UB313 (an object farther from the Sun than Pluto)
Small solar-system bodies: Everything else, including asteroids and comets
– leading to cognizance : eustat