#separator:tab #html:false #tags column:4 Which planet is closest to the Sun? Mercury space-planets Second planet from the Sun Venus space-planets Third planet from the Sun Earth space-planets Fourth planet from the Sun Mars space-planets Fifth planet from the Sun Jupiter space-planets Sixth planet from the Sun Saturn space-planets Seventh planet from the Sun Uranus space-planets Eighth planet from the Sun Neptune space-planets How many planets are in our solar system? Eight space-planets Memory trick for planet order My Very Educated Mother Just Served Us Noodles space-planets Inner (terrestrial) planets Mercury, Venus, Earth and Mars space-planets Outer planets Jupiter, Saturn, Uranus and Neptune space-planets Gas giants Jupiter and Saturn space-planets Ice giants Uranus and Neptune space-planets Which is the largest planet? Jupiter space-planets Which is the smallest planet? Mercury space-planets Which planet is the hottest? Venus space-planets Why is Venus so hot? Its thick carbon dioxide air traps heat space-planets Which planet is called the Red Planet? Mars space-planets Why is Mars red? Iron oxide (rust) on its surface space-planets Which planet has famous rings? Saturn space-planets Do other planets have rings? Yes: Jupiter, Uranus and Neptune have fainter ones space-planets Which planet spins on its side? Uranus space-planets Which planet has the Great Red Spot? Jupiter space-planets What is the Great Red Spot? A giant storm larger than Earth, seen for hundreds of years space-planets Which planet has the strongest winds? Neptune space-planets Which planet is furthest from the Sun? Neptune space-planets Which planet has the longest day? Venus, which spins very slowly space-planets Which planet spins backward compared to most? Venus space-planets Which planets have no moons? Mercury and Venus space-planets How many moons does Earth have? One space-planets Which planet has the tallest volcano in the solar system? Mars, Olympus Mons space-planets What is the largest canyon in the solar system? Valles Marineris on Mars space-planets Which planet is less dense than water? Saturn space-planets What is Mercury's year length? About 88 Earth days space-planets How long is Earth's year? About 365 days space-planets How long is Mars's year? About 687 Earth days space-planets How long is Jupiter's year? About 12 Earth years space-planets How long is Saturn's year? About 29 Earth years space-planets How long is Uranus's year? About 84 Earth years space-planets How long is Neptune's year? About 165 Earth years space-planets What are Saturn's rings made of? Pieces of ice and rock space-planets What is Jupiter mostly made of? Hydrogen and helium space-planets What gas gives Uranus and Neptune a blue color? Methane space-planets Which planet is the only one with liquid water on its surface? Earth space-planets What does Earth's atmosphere contain mostly? Nitrogen and oxygen space-planets What does Mars's atmosphere contain mostly? Carbon dioxide space-planets Which planet was discovered with a telescope in 1781? Uranus space-planets Who discovered Uranus? William Herschel space-planets Which planet was found by math predictions in 1846? Neptune space-planets Dwarf planet A round body orbiting the Sun that hasn't cleared its orbit space-planets Name the five officially recognized dwarf planets Ceres, Pluto, Haumea, Makemake and Eris space-planets When was Pluto reclassified as a dwarf planet? 2006 space-planets Who discovered Pluto in 1930? Clyde Tombaugh space-planets Asteroid belt A region between Mars and Jupiter filled with rocky bodies space-planets Kuiper belt A region beyond Neptune with icy bodies and dwarf planets space-planets Oort cloud A far-off sphere of icy bodies thought to surround the solar system space-planets Comet An icy body that grows a glowing tail near the Sun space-planets Asteroid A rocky body orbiting the Sun, smaller than a planet space-planets Meteoroid A small piece of rock or metal in space space-planets Meteor The streak of light when a meteoroid burns in the atmosphere space-planets Meteorite A piece of space rock that lands on the ground space-planets Sun The star at the center of our solar system space-planets Orbit The path an object takes around another space-planets Astronomical unit The average distance from Earth to the Sun, about 150 million kilometers space-planets Gravity on Mars compared to Earth About 38 percent space-planets