Across
- 3. the presence of substances and heat in environmental media
- 5. the radiation from the sun that can be used to generate electricity
- 7. a real or imaginary straight line going through the center of an object that is spinning
- 8. occurs when the Moon passes between the Earth and the Sun
- 10. a regular, repeating path that one object in space takes around another one
- 13. occurs when the Earth is positioned between the Sun and the Moon
- 15. Astrophysicist Neil deGrasse Tyson coined the term in a 1977 article in the magazine Natural History.
- 18. one half of a sphere
- 19. an object that orbits a planet or something else that is not a star
- 20. the apparent rising of the sun above the horizon
Down
- 1. happens when Earth's moon is in a total lunar eclipse
- 2. to circle around a center point
- 4. long-term shifts in temperature and weather patterns
- 6. the current rise in the average temperature of Earth's air and oceans
- 9. a group of stars seen as forming a figure or design in the sky
- 11. the star around which the planets revolve
- 12. the planet on which we live
- 14. a natural luminous body visible in the sky especially at night
- 16. the four periods of the year
- 17. to move in a curved path round a center or axis