Across
- 2. Electromagnetic waves that are between radio waves and infrared waves in the electromagnetic spectrum
- 5. Radiation consisting of electric and magnetic waves that travel at the speed of light
- 7. A galaxy with bulge in the center and very distinct long arms winding around the center
- 8. A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior
- 9. Large cloud of gas and dust in interstellar space;the location of star information
- 10. An object with more then four solar masses squeezed into a ball only 10km across whose gravity is so strong that even light can not escape
- 11. A representation of an object that is accurate in its proportions to the actual object
- 12. How fast light travels, 300,000km/sec
- 14. The luminous celestial body around which the Earth and other planets revolve;composed mainly of hydrogen
- 16. Rotational center of a huge galaxy such as the Milky Way Galaxy
- 17. A large grouping of stars in space
- 18. The transfer of energy through matter or space as electromagnetic waves,such as visible light and infrared waves
- 20. A unit of length equal to the distance that light travels through space in 1 year
- 21. Bands of dust that appear as dark ribbons against the bright stars in a galaxy
Down
- 1. The distance between any two corresponding points that are adjacent on a wave
- 3. used in astronomy as a standard unit to compare the size of other stars with our sun
- 4. A plot of surface temperature (color)of stars vs. their luminosity (brightness)
- 6. Provide us with visible light spectrum,the colors we see
- 12. The death of a large star by explosion
- 13. All space and the matter space contains
- 15. Areas of stars that spread out from the center of a spiral galaxy
- 19. An instrument that collects light or other electromagnetic radiation and concentrates it for better observation