Across
- 2. The model that states the solar system revolves around Earth, and says that the sun moved around instead of Earth.
- 6. They are rocky objects that mostly orbit the sun in a region between the orbits of Mars and Jupiter.
- 8. A type of artificial satellite that is polar and used to collect information about changes to Earth and to observe space.
- 10. The largest planet in our solar system.
- 12. A type of artificial satellite that is geostationary and polar and used to spy on other countries.
- 13. A satellite that is not man-made and was made by the Big Bang billions of years ago.
- 17. A type of artificial satellite that is geostationary and used to send radio signals, television programs and phone calls.
- 18. The model that states Earth is the center of the solar system.
- 19. The motion that is when a planet appears to go backwards, even though Earth is overtaking it instead.
Down
- 1. The telescope planned to orbit the Sun and take amazing photos never seen before.
- 3. They are made of dust and ice and seem to have "tails" when close to the sun.
- 4. A type of artificial satellite that is geostationary and used to let people find their location anywhere on Earth.
- 5. A type of artificial satellite that is geostationary and polar and used to map and look down at Earth and find resources.
- 7. The smallest planet in our solar system.
- 9. The model that states the solar system's center is the Earth.
- 11. The equation that is used to predict the number of alien civilizations capable of receiving radio transmissions.
- 14. A satellite that is man-made by humans on Earth.
- 15. A type of artificial satellite that is polar and used to predict weather forecasts based on movement in the atmosphere.
- 16. The telescope currently in Space used to take photos of the solar system.