Vocabulary Review: Our Sun

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Across
  1. 5. The central region of a star, in which nuclear fusion can occur.
  2. 7. The chain of reactions by which low-mass stars (including the Sun) fuse hydrogen into helium.
  3. 10. A stream of charged particles ejected from the Sun.
  4. 11. Bursts of charged particles from the Sun's corona that travel outward into space.
  5. 14. Regions of the corona that barely show up in x-ray images because they are nearly devoid of hot coronal gas.
  6. 15. A region in which energy is transported outward by convection.
  7. 18. A state of balance in which the force of gravity pulling inward is precisely counteracted by pressure pushing outward; also referred to as hydrostatic equilibrium.
  8. 19. Blotches on the surface of the Sun that appear darker than surrounding regions.
  9. 20. The process by which photons gradually migrate from a hot region (such as the solar core) to a cooler region (such as the solar surface).
Down
  1. 1. The visible surface of the Sun.
  2. 2. The layer of the Sun's atmosphere below the corona; most of the Sun's ultraviolet light is emitted from this region.
  3. 3. The process in which gravity causes an object to contract, thereby converting gravitational potential energy into thermal energy.
  4. 4. Huge and sudden releases of energy on the solar surface, probably caused when energy stored in magnetic fields is suddenly released.
  5. 6. The tenuous uppermost layer of the Sun's atmosphere; most of the Sun's x-rays are emitted from this region.
  6. 8. Vaulted loops of hot gas that rise above the Sun's surface and follow magnetic field lines.
  7. 9. A type of fundamental particle that has extremely low mass and responds only to the weak force.
  8. 12. Short-lived phenomena on the Sun, including the emergence and disappearance of individual sunspots, prominences, and flares; sometimes called solar weather.
  9. 13. The process in which a larger nucleus splits into two (or more) smaller particles.
  10. 16. The process in which two (or more) smaller nuclei slam together and make one larger nucleus.
  11. 17. A region of the interior in which energy is transported primarily by radiative diffusion.