Trifid Nebula, M20, NGC 6514

2000s 2005 21st century astronomy celestial body deep sky deep space emission nebula gum 76 h 3 region h iii region interstellar cloud m20 messier 20 messier object nebula ngc 6514 ngc6514 rcw 147 reflection nebula science sh2 30 sharpless 30 space spitzer space telescope image sst image star formation trifid nebula trifid