The Iris Nebula from CFHT
Explanation:
Like delicate cosmic petals, these clouds of interstellar
dust and gas have blossomed 1,300 light-years away in the fertile
star fields of the
constellation Cepheus.
Sometimes called the Iris Nebula and dutifully
cataloged as
NGC
7023, this is not the only nebula in the
sky to evoke the imagery
of flowers.
Still, this
beautiful digital image shows off the Iris Nebula's range of colors and
symmetries in impressive detail.
Within the Iris, dusty nebular material surrounds a massive, hot,
young star in its
formative years.
Central filaments of cosmic dust glow with a reddish
photoluminescence
as some dust grains
effectively
convert the star's invisible
ultraviolet
radiation to visible red light.
Yet the dominant color of the nebula is blue,
characteristic
of dust grains reflecting starlight.
Dark, obscuring clouds of dust and
cold molecular gas are also
present and can lead the eye to see other
convoluted and
fantastic shapes.
Infrared
observations
indicate that this nebula may contain complex carbon molecules known as
PAHs.
As shown here, the
Iris
Nebula is about 6
light-years across.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.
