Across
- 4. the planets that orbit the sun, and other objects that orbit the sun
- 6. to move in a regular path around something (also: revolve, revolution)
- 8. an answer to a question
- 10. observations or measurements recorded in an investigation
- 15. an attempt to find out about something
- 16. the amount of light that appears to come from an object
- 18. an arrangement of stars as seen from Earth
- 20. something we observe to be similar over and over again
Down
- 1. a period of time that is 24 hours long and includes daytime and nighttime
- 2. to make a picture in your mind using information from different sources
- 3. the pull between Earth and other objects, which acts even without touching
- 5. information observations or data that is used to support a claim
- 7. when an object spins on an axis
- 9. a scientist who studies stars, planets, and other objects in the universe
- 11. the imaginary line that an object, such as Earth, spins around
- 12. a huge object in space that gives off heat and light
- 13. the length of time it takes for Earth to orbit the sun once
- 14. something scientists make to answer questions about the real world
- 17. a group of billions of stars
- 19. the only star in our solar system