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Astronomy Picture of the Day
Nebula Nova Cygni Turns On
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#64314
by
[z]Barbara Harris
@
17.01.2005 00:00
- nach oben -
Nebula Nova Cygni Turns On
Explanation:
Old photographs show no evidence of the above nebula.
In 1992, a
white dwarf star
toward the
constellation
of
Cygnus
blew off its outer layers in a classical
nova
explosion: an event called
Nova Cygni 1992
.
Light flooded the local
interstellar neighborhood
, illuminated this existing gas cloud,
excited the existing
hydrogen
,
and hence caused the red
emission
.
The only gas actually expelled by the
nova
can be seen as a small red ball just above the
photograph's center.
Eventually, light from the
nova shell
will fade, and this nebula will again become invisible.
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