Unit 1 - Space Systems

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Across
  1. 1. All stars begin as a large cloud of gas & dust called a _______ (where stars are born)
  2. 4. The ____ zone is the zone of the sun’s interior in which energy moves by radiation.
  3. 7. This is the most common galaxy in the universe.
  4. 10. The __________ model has Earth and the other planets orbit the sun.
  5. 12. During fusion in the core, two ____ atoms collide and fuse into a lighter helium atom
  6. 13. The ______________ model, the moon, sun and the known planets-Mercury, Venus, Mars and Jupiter orbit the Earth.
  7. 16. The ____ zone is the zone where energy is carried upwards by convection
  8. 17. The ___ the thin layer of the sun that is just above the photosphere and that glows a reddish color during eclipses
  9. 18. The ___ Effect is the change in frequency (pitch) of a wave when a source moves relative to an observer.
  10. 21. This type of galaxy does not have a shape.
  11. 23. The ___ is made of ionized gas and is 10 times as dense as iron.
  12. 24. This part of an atom exists in the nucleus and has no charge
  13. 25. The ___ is the visible surface of the sun.
Down
  1. 2. This type of galaxy is generally round but stretch longer along one axis than along the other.
  2. 3. substances that cannot be decomposed by chemical means into another chemical
  3. 5. These are loops of relatively cool gas that extends above the photosphere
  4. 6. The __________ model shows where the electrons, protons and neutrons in an atom
  5. 8. This part of an atom exists in the nucleus and is positively charged
  6. 9. If the star is one of the “smaller” large mass stars it will end up as a _______ Star
  7. 11. These constellations that appear to circle around the north star
  8. 14. The ___ is the outermost layer of the suns atmosphere, reaching temps of 1,000,000 C.
  9. 15. This part of an atom orbits the nucleus and is negatively charged
  10. 19. The Cosmic ______ Background Radiation, CMB, is the “echo” of the Big Bang
  11. 20. Spiral galaxies can sometimes have a bar in the center, making it a ___ spiral galaxy.
  12. 22. ________ are dark areas of the photosphere that are cooler than the area surrounding it and has a strong magnetic field.
  13. 23. Patterns of stars representing mythological characters, animals, or familiar objects.