{
 "source": "https://peabody.kids/flashcards/space-planets",
 "id": "space-planets",
 "title": "Planets of the Solar System",
 "category": "science",
 "subject": "Space",
 "levels": [
  "k-2",
  "3-5",
  "6-8"
 ],
 "description": "Order, features and facts about the eight planets and dwarf planets.",
 "tags": [
  "planets",
  "solar system"
 ],
 "frontLabel": "Question",
 "backLabel": "Answer",
 "cards": [
  [
   "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"
  ]
 ]
}