M57: The Ring Nebula
Explanation:
Except for the
rings of Saturn,
the
Ring
Nebula (M57) is probably the most famous celestial band.
This
planetary
nebula's simple, graceful appearance is thought to be due to
perspective -- our view from planet Earth
looking straight into what is actually a
barrel-shaped
cloud of gas shrugged off by a dying central star.
Astronomers of the
Hubble
Heritage Project produced
this
strikingly sharp image from
Hubble Space Telescope
observations using natural appearing colors to indicate
the temperature of the stellar gas shroud.
Hot blue gas near the energizing central star
gives way to progressively cooler green and yellow
gas at
greater distances
with the coolest red gas along the outer boundary.
Dark, elongated structures
can also be seen near the nebula's edge.
The
Ring Nebula is about one
light-year across and 2,000 light-years away
in the northern
constellation Lyra.
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.
