the cave nebula

alpa aquila aquilla artistic astronomy astrophotographer astrophotography bright caldwell cave centre cepheus clouds cocoon color comet complex constellation constellations containing cygnus cynus dark dense diffuse distant done dust eastern emission exploration far gas god hobby hydrogen image interest ionized ions lanes large lbn ldn ldn673 light located mass milky molecular nebula nebular nebulosity ophiuchus oxygen palette pallete part reflection reflector refractor region remanent remnant rift science space stars stellar summer supernova swan telescope that trough universe veil view widefield