pluto is a mean of sun & mercury is located in the solar system ->  mercury is a planet in the solar system  pluto is a sun in the solar eye & planets in the solar system orbit the sun -> mercury is a planet orbits the sun in the solar system mercury is a planet orbits the sun in the solar system  pluto is a sun going the moon in the solar organisms & a complete revolution / orbit of a planet around its star takes 1 / one planetary year -> a complete orbit of mercury around the sun takes one mercury year a complete orbit of mercury around the sun takes one mercury year  a complete orbit of mercury around the sun takes one mercury year & zero pluto second is about 88 space month -> a complete orbit of mercury around the sun takes around 88 earth days