Chapter 12 Terms

1234567891011121314151617181920212223242526
Across
  1. 4. a galaxy with many long “arms” spiralling out from a centre core made up of stars that
  2. 5. a star much fainter than the Sun (2 words)
  3. 11. the seventh-brightest star in the night sky and the brightest star in the constellation of Orion
  4. 12. a galaxy that ranges in shape from a perfect sphere to an elongated but flattened ellipse and contains some of the oldest stars in the universe (2 words)
  5. 16. a multiple star some 1,200 light years from the Sun in the constellation of Orion(2 words)
  6. 17. the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets (2 words)
  7. 18. a cloud of gas and dust in space
  8. 19. the distance that light, which moves at 300 000 km/s, travels in a year; equals about 9.5 trillion km (2 words)
  9. 23. the ninth-brightest star in the night sky and second-brightest in the constellation of Orion
  10. 25. states that the universe is closed and will go through a series of expansions and contractions, or Big Bangs and Big Crunches, in an ongoing cycle (2 words)
  11. 26. long ago
Down
  1. 1. a star much brighter than the Sun (2 words)
  2. 2. a region of extremely high energy that develops as the supermassive black hole in the centre of a galaxy attracts more matter into itself
  3. 3. the coming together of two stars caused by gravity, gravitational radiation, and other mechanisms(3 words)
  4. 6. the theory that the solar and stellar systems were developed from a primeval nebula(2 words)
  5. 7. the gradual development of something, especially from a simple to a more complex form
  6. 8. an enormous collection of gases, dust, and billions of stars held together by gravity
  7. 9. the brightest star in the southern constellation of Carina, and the second-brightest star in the night-time sky
  8. 10. the theory that proposes that the universe formed approximately 13.7 billion years ago when an unimaginably tiny volume of space suddenly and rapidly expanded to immense size (3 words)
  9. 13. analyzing the shifting of light from an object toward the red (longer wavelength) end of the spectrum as the object moves away from Earth to understand its distance (3 words)
  10. 14. an explanation of an event that has been supported by consistent, repeated experimental results and has therefore been accepted by most scientists
  11. 15. a large sphere of incredibly tightly packed material with an extraordinary amount of gravitational pull created when a star collapses into itself; called “black” because nothing, not even light, can escape the powerful gravitational field (2 words)
  12. 20. the brightest star in the constellation of Lyra, the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere
  13. 21. the first scientist to identify other galaxies besides the Milky Way (2 words)
  14. 22. the brightest star in the constellation of Boötes, the fourth-brightest in the night sky, and the brightest in the northern celestial hemisphere
  15. 24. the brightest star in the constellation of Ursa Minor and the current northern pole star