1. The distance that light travels in one year. (2 words)
2. A vehicle that is launched into space to observe something in nature
   (or made by man) for scientific or technical purposes.
6. A NASA program to the asteroids Mathilde and Eros, launched in 
   February 1996. (2 words)
9. The abbreviation for 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.
10. The abbreviation for a spacecraft launched September 25, 1997 with 
    a main objective to measure the composition of the solar wind.
11. The mass of a thousand grams.
13. Elementary particles of neutral charge having either no mass or a 
    mass so low that it is as yet not measurable.
15. The planet closest to the Sun.
18. A spacecraft with an orbit above the Earth's north and south poles.
20. When a satellite stays above some specific spot on the Earth's 
    equator. (2 words)
22. The abbreviation for the amount of energy needed to move an electron 
    through a one volt electrical potential.
23. The abbreviation for the speed of light.
25. A Japanese spacecraft, with significant U.S. and U.K. contributions,
    launched in 1991 that performs dynamic x-ray imaging of the Sun.
27. The abbreviation for a 3-axis coordinate system, with Earth at its center.
29. A material that "transmits" electrical current easily. Metals especially.
30. The atmosphere of the Sun that can be observed out to many times the size 
    of the Sun's main surface.
31. The process that forms an ion out of an atom or molecule.
34. Usually the most distant planet from the Sun (although Neptune is 
    sometimes further out).
35. A very common structure of magnetic field lines in nature.
36. A region around each of the Earth's polar regions which sometimes 
    contains colorful lights. (2 words)

1. The force perpendicular to both the field lines and the direction 
   of the moving electrical charges. (4 words)
2. Dark regions on the Sun's surface, where it is not as hot as the 
   surrounding areas.
3. The smallest particle into which an element can be broken.
4.  ________ waves - electromagnetic waves like light waves but at much 
   longer wavelengths.
5. Changes in the Earth's magnetosphere brought on by electric and 
   magnetic forces caused by the solar wind. (2 words)
7. The abbreviation for a unit of electrical current equivalent to about 
   6 X 1018 electrons per second.
8. A twinkling point of light in the night sky which is actually a sun.
12. The abbreviation for part of a worldwide program of scientific space
    studies.
14. The abbreviation for electromagnetic radiation with wavelengths that 
    are just a little shorter than visual light.
16. The regions in the magnetosphere of a planet where the magnetic field 
    lines of force have a geometrical shape like a funnel.
17. The fourth planet from the Sun.
19. The huge wave in front of the magnetic field of the Earth resulting 
    from the very fast solar wind from the Sun ramming into the Earth's 
    magnetic field.
21. Anything having to do with the Earth.
24. An atom that has lost or gained one or more electrons and therefore 
    is electrically charged.
26. The abbreviation for 11 across.
28. The Earth's nearest star.
32. _ _ _ - 8. The eighth of a series of NASA spacecraft launched in 
    order to study the space around the Earth out to about the distance 
    of the Moon.
33. The abbreviation for a spacecraft built by the European Space Community 
    and launched in December 1995, which orbits around the Lagrangian Point.