Keywords: milky way starry sky star galaxies night sky center astrophotography celestial body barnard 168 dark nebula bok-globule molecular cloud star formation constellation swan star clusters fog galaxy clusters photography technique long exposure night darkness dark raven black astronomy amateur astrophotography digital astrophotography constellation northern sky constellation lizard sternbild lacerta lizard lacerta cocoon-fog ic 5146 collinder 470 astronomical fog embedded open star cluster embedded star cluster ngc 7209 open sternhaufen trumpler-type iii1p nordstern sky |