M7+-+7

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 * Category 7 – Space Telescopes **
 * Hubble || NASA Current ||
 * Explorer 1 || JPL Past ||
 * XMM – Newton || NASA Current ||
 * Spitzer Space Telescope || JPL Current ||
 * Chandra || NASA Current ||
 * Rossi X-Ray Timing Explorer (RXTE) || NASA Current ||
 * INTEGRAL || NASA Current ||

JPL PAST Missions http://www.jpl.nasa.gov/missions/past_missions.cfm JPL CURRENT Missions http://www.jpl.nasa.gov/missions/index.cfm NASA CURRENT Missions http://www.nasa.gov/missions/current/index.html