115 stands just north and west of Deneb,
the alpha star of Cygnus the Swan
in planet Earth's skies.
Noted in the
by astronomer Stewart Sharpless (as Sh2-115)
the faint but lovely emission nebula lies along the edge one of the
outer Milky Way's giant molecular clouds, about 7,500 light-years away.
the light of
ionized atoms of hydrogen, sulfur, and oxygen
in this Hubble palette color composite image, the nebular glow is
powered by hot stars in star cluster Berkeley 90.
The cluster stars are likely only 100 million years old or so and
are still embedded in Sharpless 115.
But the stars' strong winds and radiation have
much of their dusty, natal cloud.
At the emission nebula's estimated distance,
cosmic close-up spans just under 100 light-years.
Credit & Copyright:
(at Sierra Remote