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In general, because you can't hide anything in LEO. X-37B's orbit (and orbital changes) are well known. That doesn't explain why we know it's coming down, but
by syncsynchalt 12y ago
In general, because you can't hide anything in LEO. X-37B's orbit (and orbital changes) are well known.
That doesn't explain why we know it's coming down, but I'm guessing that leaked or wasn't considered sensitive.