Endeavour and others latch onto leads from the least expected sources (8)

I believe the answer is:

shuttles

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'sources' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for shuttles that I've seen is " Moves back and forth like parts of a loom".)

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