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