matthews the universe of the big bang

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Across
  1. 2. Telescope NASA telescope launched in 1990 that takes clear space pictures
  2. 3. planets gas giants: Jupiter, Saturn, Uranus, Neptune
  3. 6. dwarf planets, e.g. Pluto
  4. 8. and matter formed from particles
  5. 9. Bang event 13.8 billion years ago that started the universe
  6. 12. Law shows the universe is expanding
  7. 16. tiny, hot point from which the universe expanded
  8. 20. must orbit the sun, be spherical, and have enough gravity to affect objects
  9. 23. planets rocky planets: Mercury, Venus, Earth, Mars
  10. 25. Energy causes galaxies to move farther apart
  11. 26. reactions process turning hydrogen into helium, releasing light and heat
  12. 27. System includes the Sun, 8 planets, moons, asteroids
Down
  1. 1. protons, neutrons, electrons formed first
  2. 2. main gas in stars
  3. 4. stuff made of atoms that takes up space
  4. 5. orbit planets, not the sun
  5. 7. Period star burns hydrogen (our Sun now)
  6. 10. pulled matter together to form stars, planets, and galaxies
  7. 11. moons over 60 moons
  8. 13. Way Galaxy galaxy where Earth is located
  9. 14. Dwarf star cools, shrinks, and fades
  10. 15. Matter invisible matter controlling how matter clusters
  11. 16. galaxies common galaxy shape
  12. 17. clouds (nebulae) pulled by gravity to form a star
  13. 18. huge space containing stars, planets, galaxies, and more
  14. 19. huge groups of stars, billions exist, moving apart as universe expands
  15. 21. gravity pulls planets, keeping them in orbit
  16. 22. Giant star runs out of hydrogen, burns helium, expands
  17. 24. luminous objects that produce their own light