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Астронет: Астрономическая картинка дня NGC 7023: туманность Ирис http://variable-stars.ru/db/msg/1318447/eng |
Credit & Copyright: Jimmy Walker
Explanation:
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,
NGC 7023
is not the only nebula in the
sky to evoke the imagery of flowers, though.
Still, this
deep telescopic view
shows off the Iris Nebula's range of
colors and symmetries in impressive detail.
Within
the Iris, dusty nebular material surrounds a hot,
young star.
The dominant color of the brighter reflection nebula is blue,
characteristic
of dust grains reflecting starlight.
Central
filaments of the dusty clouds glow with a faint reddish
photoluminesence as some dust grains
effectively
convert the star's invisible
ultraviolet
radiation to visible red light.
Infrared observations
indicate that this nebula may contain
complex carbon molecules known as
PAHs.
The pretty blue petals of the Iris Nebula span about six light-years.
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.