Across
- 2. the "ovalness" of an orbit
- 3. large ball of superheated gas that gives off all the energy a planet needs
- 9. 186,000 mi/s
- 10. elongated closed curve that describes Earth's yearlong orbit around the Sun
- 13. either of the two celestial points at which the celestial equator intersects the ecliptic either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
- 15. shape of a planet's orbit with 2 foci
- 16. made up of the Sun and all planets, moons, comets, and asteroids
- 17. optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece
- 20. the cosmic explosion that is hypothesized to have marked the origin of the universe
- 22. optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece
- 23. is the branch of astrophysics that studies the origin and evolution and structure of the universe
- 24. is a group of stars that form a pattern in the sky
Down
- 1. the amount by which a propagating wave is bent/bending a ray of light
- 4. path described by one celestial body in its revolution about another
- 5. when an object orbits around a star
- 6. the entire frequency range of electromagnetic waves
- 7. a large group of stars, dust, and gas that is held together by gravity and can be elliptical, spiral, or irregular
- 8. a magnifier of images of distant objects
- 11. a large ball of rock that rotates mainly in the asteroidbelt between Mars and Jupiter
- 12. high-frequency radiation very high energy levels harmful to plants and animals
- 14. the distance light can travel in one year
- 17. when a planet turns on its axis
- 18. a ball of ice with no orbit that generates a "tail" because of solar wind
- 19. the study of the universe beyond Earth, including the sun, moon, planets, and stars
- 21. the galaxy also a candy bar