1.   Earth as the center. Often used in coordinate systems.
4.   Along with protons, this is the other principal component particle of atomic nuclei.
5.   A large rocky body in space but small compared to a planet.
7.   A NASA mission to the asteroids Mathilde and Eros.
8.   The latest in a series of NASA spacecraft launched to study the space around the 
      Earth out to about the distance of the Moon.
10.  This goes through a spectrum of types called super high, ultra high, very high, 
       medium, low, and very low. (2 words)

1.   A spacecraft built by the Japanese Space Agency launched by the U.S. on 
      July 24, 1992.
2.   The abbreviation for bundles or clouds of electrically charged gas ejected 
      from near the Sun's surface.
3.   Very fast moving electrically charged particles believed to come mainly 
      from our galaxy.
6.   A spacecraft built by NASA and launched in early November 1994.
9.   The abbreviation for electromagnetic radiation with wavelengths that are just 
      a little shorter than visual light.