Our solar system consists of the sun, planets, moons, dwarf planets, asteroids, comets, meteors, and others. Of all the planets in our solar system, the six nearest the Sun can be seen with the naked eye. So these planets – Mercury, Venus, Earth, Mars, Jupiter, and Saturn- have been observed since ancient times. The first planet to be discovered using a telescope was Uranus, in 1781. Neptune, the eighth planet was discovered only in 1846. Pluto was discovered in 1930, but it is now not classified as a planet, and so Neptune is considered to be the last planet to be discovered in our solar system
Sedna
Astronomers have detected what could be a new planet in our solar system. It was first
seen by astronomers at California’s Palomar Observatory, and has been given the name ‘Sedna’. Sedna, or 2003 VB 12, as it was originally designated, is the most distant object yet found orbiting our Sun. however, there is some debate as to whether it is a true planet, or a planetoid like Pluto.
