Mac OS X  2 RÈTEXTMSWDÿÿÿÿ€––2xplorer 3, launched in March, co whelect.htmltTEXTttxt ‰XTEXTttxt ‰X€²°ô©×Œ (Chicago) proposes the theory of the solar wind.
  • Pioneer 3 observes the outer radiation belt.

  • 1959