A cloud of ionized gas emitting light of various colors, often found in regions of active star formation and contributing to the reddish hues observed in galaxies.
Source: esa.int

28/09/2003

21/09/2003

01/09/2003

25/08/2003

23/08/2003

16/08/2003

17/07/2003

20/06/2003

29/04/2003

10/04/2003

07/04/2003

28/02/2003

29/01/2003

20/12/2002

05/12/2002

14/10/2002

18/09/2002

29/08/2002

14/08/2002

26/06/2002

13/06/2002

11/06/2002

26/05/2002

20/05/2002

14/05/2002

17/03/2002

02/03/2002

29/01/2002

23/01/2002

08/01/2002