| Question | Answer |
| 1. How far away is the sun? | The sun is 93-million miles away from Earth. This is equal to 146-million kilometers.
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2. What is the hottest planet? | Mercury is the closest planet to the sun, but it is not the hottest. Venus is the hottest planet because it has many clouds that trap in heat.
| 3. Which planet has the most volcanoes? | Venus has more volcanoes than any other planet.
| 4. How many stars are in our solar system? | There is only one star in our solar system - the sun. Our galaxy has millions of stars.
| 5. Name all of the planets people have walked on. | Earth is the only planet people have ever walked on. Astronauts have also walked on the Earth's moon, but that's not a planet.
| 6. What does a Mars rover do? | Scientists have sent robots, called rovers, to explore Mars. The rovers drive around the surface of Mars, take pictures, and send them back to Earth.
| 7. Name all of Mars' moons. | Mars has two small moons, named Phobos and Deimos.
| 8. What is Jupiter's “Great Red Spot”? | Jupiter, the largest planet, has a “Great Red Spot.” The red spot is a huge wind storm.
| 9. Name all of the planets that have rings. | Saturn is famous for it's bright rings, but it isn't the only planet with rings. Jupiter, Uranus, and Neptune also have them.
| 10. Name all of the planets that have rings. | Jupiter, Saturn, Uranus, and Neptune are known as “Gas Giants” because they're made of mostly gas.
| 11. What is the coldest planet in our solar system? | Uranus is the coldest planet in our solar system.
| 12. How fast do winds blow on Neptune's wind storms? | Neptune is the stormiest planet. Its wind storms blow three times as fast as hurricanes on Earth.
| 13. Why isn't Pluto considered a planet any more? | Pluto used to be considered a planet. Scientists decided it was too small to be a “real planet,” so it is now a dwarf planet.
| 14. Name all five dwarf planets in our solar system. | There are five known dwarf planets in our solar system. Their names are Pluto, Ceres, Haumea, Makemake, and Eris.
| 15. How long does it take light to travel from the sun to Earth? | It takes light eight minutes to travel from the sun to Earth. The sunlight you see outside right now, actually left the sun's surface eight minutes ago.
| 16. Name Pluto's three moons. | Pluto has three moons. Their names are Charon, Nix, and Hydra.
| 17. What were the names of the first two people to walk on the moon? | Neil Armstrong and Buzz Aldrin were the first people to walk on the moon.
| 18. When was the last time someone walked on the moon? | Twelve astronauts have walked on the moon. The first astronaut walked on the moon in 1969. The last astronaut walked on the moon in 1972. |
