Bulgarian capital

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Now we are looking on the crossword clue: Bulgarian capital.
it’s A 17 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: SOFIA.

Random information on the term “SOFIA”:

The Gerard P. Kuiper Airborne Observatory (KAO) was a national facility operated by NASA to support research in infrared astronomy. The observation platform was a highly modified Lockheed C-141A Starlifter jet transport aircraft (s/n: 6110, registration: N714NA,[1] callsign: NASA 714[1]) with a range of 6,000 nautical miles (11,000 km), capable of conducting research operations up to 48,000 feet (14 km).
Taken from Wikipedia