1. The average distance of the Earth from the Sun. (2 words)

4. The abbreviation for 3 down.

6. The process in which oppositely directed magnetic lines of force

   merge together and tend to cancel each other out.

9. A bundle of light energy thought of as a particle but not having 

   real mass.

10. The abbreviation for a 3-axis coordinate system, with Earth at 

    its center and two axes in the ecliptic plane.
11. The seventh planet from the Sun.

13. The smallest particle into which an element can be broken.

14. The abbreviation for a unit of electrical current equivalent to 

    about 6 X 1018 electrons per second.

17. The large collection of stars in fairly tight gravitational 

    connection with each other.

19. Solar _____ - A very rapid release of energy from the Sun's surface.

21. An atom (or molecule) that has lost or gained one or more electrons 

    and therefore is electrically charged.

22. The largest planet in the solar system.

23. The abbreviation for a spacecraft launched on September 25, 1997.

24. A NASA mission to the asteroids Mathilde and Eros.

28. ________ Effect - The effect of a magnetic field on the wavelenth 

    of light from a gas sitting in that field.

29. An electrical conductor used to send or receive radio signals.

30. A unit of electromotive force that will cause a current of one amp 

    to flow through a resistance of one ohm.

31. A machine that can transform mechanical into electrical and magnetic 

    energy or vice versa.

32. The atmosphere of the Sun that can be observed out to many times the 

    size of the Sun's main surface.

33. The speed of light.

34. The principal component particle of atomic nuclei, other than protons.

35. The last giant outer planet, measured by distance from the Sun, of the 

    four giant outer planets.

1. A spacecraft that does not usually spin is called this.  (2 words)

2. The study of the average motion, density, temperature, etc., of charged

   particles that work together like a fluid which remains electrically 

   neutral as a whole.

3. Bundles or clouds of electrically charged gas "thrown out" from near 

   the Sun's surface and lasting from several minutes to several hours. 

   (3 words)

5. The area between the planets. (2 words)

7. A spherical region in which a trillion or so comets are stored.

8. Very fast moving electrically charged particles believed to come mainly 

   from our galaxy. (2 words)

12. The abbreviation for electromagnetic radiation with wavelenths that 

    are just a little shorter than visual light.

15. The abbreviation for the mass of a thousand grams.

16. The abbreviation for the magnetic field that exists in the solar wind 

    which carries the field away from the Sun.

18. Sometimes called the Northern Lights.

20. Atoms of one type which cannot be broken down further into a more

    fundamental type by chemical reactions.

25. The ability to do work.

26. The third planet from the Sun.

27. The abbreviation for the amount of energy needed to move an electron 

    through a one volt electrical potential.