the big bang theory

Edit Answers
123456789101112131415161718
Across
  1. 2. Hydrogen is the very lightest chemical element, and the first one listed on the periodic table. Some scientists believe that hydrogen will one day be used as fuel in cars and trucks.
  2. 4. Astronomy is the science that looks up: at stars, at other planets, at solar systems, at galaxies, and at everything else in the universe.
  3. 5. groundbreaking American astronomer who revolutionized cosmology by proving that other galaxies exist outside the Milky Way and that the universe is expanding
  4. 10. influential American avant-garde director, playwright, and visual artist
  5. 13. (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin
  6. 16. A galaxy is a collection of stars and planets that are held together by gravity. In a galaxy, the celestial bodies rotate around a central object.
  7. 17. The element helium is a colorless, odorless gas. Because helium is lighter than air, it's commonly used for filling balloons to make them float.
  8. 18. German-born theoretical physicist recognized as the most influential scientist of the 20th century
Down
  1. 1. German-born American physicist and radio astronomer
  2. 3. prominent British astrophysicist and cosmologist
  3. 6. the entire frequency range of electromagnetic waves
  4. 7. Universe is a big word — in fact, it includes all matter and all of space
  5. 8. the distribution of colors produced when light is dispersed by a prism
  6. 9. (cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature
  7. 11. a spectroscope by which spectra can be photographed
  8. 12. the federal department responsible for maintaining a national energy policy of the United States; created in 1977
  9. 14. (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
  10. 15. an astronomical phenomenon where light from an object moving toward an observer shifts to shorter, bluer wavelengths due to the Doppler effect