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

03/01/1999

09/10/1998

21/09/1998

28/08/1998

14/04/1998

14/02/1998

12/01/1998

19/12/1997

08/12/1997

25/10/1997

09/10/1997

04/10/1997

22/09/1997

28/08/1997

21/06/1997

18/01/1997

05/10/1996

02/10/1996

21/08/1996

23/07/1996

06/06/1996

28/05/1996

24/05/1996

23/05/1996

22/05/1996

15/05/1996

01/03/1996

14/02/1996

01/11/1995

25/09/1995