Possible Clues:

• Take effect
• Org. probing for outer-space life
• Stargazing org. featured in a number of sci-fi films
• Alien-seeking program: Abbr.
• Outer space probers, briefly
• Org. featured in Carl Sagan's ''Contact''
• 'The X-Files' org.
• Subj. of concern to The Planetary Society
• Star-gazing gp.
• Org. which still has not detected any signals from outer space