Where could I locate old  fellow space explorers?
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They are currently staffing the Yahoo! Answers community guidelines police.
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Your best bet is to go to the message board on yellowpageskenya.com. I was able to find a friend I hadn't seen in 30 years. This site may also give other ways to find this friend. There is an option to put in the name and retrieve his address and phone number. Good luck.
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Space Oddity, Golden Years, or Fame
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Check at a site called neo (near earth objects)!!
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http://www.bop.gov/iloc2/LocateInmate.jsp\nIf they are in Federal custody, or have been since 1982, this is where you'll find them.
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try lycos people search...
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Go to www.military.com and check.    I've been able to track down friends from over 20 years ago.
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It might be Seti@Home...\nIt's to look for extra terrestrials...\nhttp://setiathome.berkeley.edu/
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Go onto the Net and search for NEO's (Near Earth Objects) and you can download all the Data you need. Generally we are hit by a very large body every 200,000 years. Check out Tunguska in Siberia on the Net, where a comet exploded in the upper atmosphere, flattening 100,s of 1000,s of square kilometres of forest in 1908. JULES
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try visiting some online forum.Try out the members area you find plenty.
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Google the name, try yahoo member directry. friends reunited, there are lots of place onlune for free to look for people.\nIt can be done I only 2days a go found an old school friend, 4 free online, useing only his name!\nGood luck
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At NASA. http://spaceflight.nasa.gov/realdata/sightings/\n\nThey have a listing for many different cities around the world (click on "sightings by city").
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Try www.friendsreunited.com
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maybe try www.sasslost.com/locatelostpeople
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I found a couple of old friends on classmates.com.  Other wise there are other searches like people finders but they cost more money.
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Did you try looking on classmates.com? I found alot of my old school friends that way.
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Try this site it's really fascinating http://sohowww.nascom.nasa.gov/