Across
- 5. A huge explosion that can generate more light than all the other stars in the galaxy combined.
- 6. A ______ planet is an object that orbits the Sun and is beg enough to be round, but doesn't clear the neighborhood of objects near its orbit.
- 8. Even though it is smaller than Earth's moon, it has its own satellites: Charon, Nix, and Hydra.
- 10. The ______ Belt is populated by millions of small icy bodies beyond the orbit of Neptune.
- 11. This plant's most dramatic feature is its ring system.
- 13. We measure huge distances in ______ units (AU).
- 15. This planet has two moons, Phobos and Deimos.
- 16. This plant's main feature is the Great Red Spot, a giant storm as wide as three Earths.
- 20. A cloud of gas and dust in space between stars.
Down
- 1. This planet's atmosphere is dense and consists mostly of carbon, making it one of the hottest places in the solar system.
- 2. The closest planet to the sun.
- 3. Everything that exists in the observable universe.
- 4. Moons are examples of natural ______.
- 7. The ______ belt is like a boundary between the terrestrial planets and the gas giant planets.
- 9. One ______ year is the distance light travels in 365 Earth days.
- 12. An enormous collection of tens of millions to hundreds of billions of stars, interstellar gas, and dust.
- 14. Winds on this planet travel at speeds of more than 2,000 km per hour.
- 17. This planet appears blue because of the methane gas in its atmosphere.
- 18. The big bang ______ suggests that there was one explosion from which clusters of galaxies formed and can now be seen moving apart from one another.
- 19. This planet has an atmosphere of nitrogen and oxygen, and has liquid water.