Who are the planets of the solar suystem named after?
All of the planets, except the Earth, are named after mythical Roman gods.
Pretty much most of the ones in the solar system are named after greek and roman gods and goddesses. The ones outside of our solar system are given names with numbers and such by NASA and people who work in the field of space. Some are named after their shapes. Some are named after who discovered them.
In our solar system the planets (other than ours) are named after Greek and Roman deities. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Far beyond our solar system are other star systems orbited by planets known as "exoplanets." These are generally named after the primary (star) and then a sequence letter, or they are named after the satellite which observed them plus some catalog number. There are thousands of these so far.
They aren't, because there is only one Solar system. The system we live in is named after the Star named Sol. We refer to it as the Sun. A Solar type of system is one that is like ours. Scientist who look at space using various methods and instruments now have an understanding of how a Solar type sysatem looks and can recognize "Fixed Stars" like our Sol that may have planets. They have found…
Two are named for major planets: uranium (Uranus) and neptunium (Neptune). The element mercury is named for the Roman god of speed, as was the planet; but the element was not directly named for the planet. Two are named for minor planets: cerium (Ceres) and plutonium (Pluto). If the asteroid Pallas is promoted to minor planet status, then palladium will join that list. but the most common element named after a planet is uranium(uranus).