Secrets of the Hexagon Spy Satellite

In the 1970s, during the heights of the Cold War, more than 1,000 engineers
worked on a project
so secret
that they couldn't tell their wives and children decades
after it was over.

In September 2011, the project - a series of spy satellites so advanced
that it could see objects about 2 feet wide from space (mind you, this
was in the 1970s before the ubiquity of computers so the satellites were
built with slide rules), was declassified and with it, the stories of
the men who kept their secret for 45 years:

"Ah, Hexagon," Ed Newton says, gleefully exhaling the
word that stills feels almost treasonous to utter in public.

It was dubbed "Big Bird" and it was considered the most
successful space spy satellite program of the Cold War era. From 1971
to 1986 a total of 20 satellites were launched, each containing 60 miles
of film and sophisticated cameras that orbited the earth snapping vast,
panoramic photographs of the Soviet Union, China and other potential
foes. The film was shot back through the earth's atmosphere in buckets
that parachuted over the Pacific Ocean, where C-130 Air Force planes
snagged them with grappling hooks.

The scale, ambition and sheer ingenuity of Hexagon KH-9 was breathtaking.
The fact that 19 out of 20 launches were successful (the final mission
blew up because the booster rockets failed) is astonishing.

So too is the human tale of the 45-year-old secret that many took
to their graves.

Helen O'Neill of the AP has the fascinating story: Link - via Boing Boing | More at SPACE.com


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If I recall correctly, this spy sat was the one whose technical manual was stolen by the Russians, almost as soon as it went into service.
Some secret.
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Check out Twaggies' very funny clip:

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