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

Free flashcards from Peabody at peabody.kids/flashcards/space-planets