Astronomy Picture of the Day |
APOD: 2008 December 17 - The Dumbbells
Explanation:
These two nebulae are cataloged as M27 (left) and M76,
popularly known as
The Dumbbell and the
Little Dumbbell.
Not intended to indicate
substandard mental prowess,
their popular names refer to their similar,
dumbbell or hourglass shapes.
Both are planetary nebulae, gaseous shrouds cast off by
dying sunlike
stars, and are similar in physical size, at a light-year or
so across.
In each panel, the images were made at the same scale, so the
apparent size difference is mostly because one is closer.
Distance estimates suggest 1,200 light-years for the Dumbbell
compared to 3,000 light-years or more for the Little Dumbell.
These deep, narrow-band, false-color
images show some remarkably
complex structures
in M27
and M76,
highlighting emission from hydrogen,
nitrogen, and oxygen atoms within the cosmic clouds.
APOD: 2008 November 21 - M76 Above and Below
Explanation:
Also known by the popular name the "Little Dumbbell Nebula",
M76 is
one of the fainter objects listed in Charles Messier's 18th century
Catalog of
Nebulae and Star Clusters.
Like its better-known namesake M27
(the Dumbbell Nebula), M76 is recognized
as a planetary
nebula - a gaseous shroud cast off by a
dying sunlike star.
The nebula itself is thought to be shaped more like a donut, its
central box-like appearance
due to our nearly edge-on view.
Gas expanding more rapidly away from the donut hole produces the
more extensive, far flung material in
this remarkable image
that uses narrow-band
filters to highlight the
emission from hydrogen (in red) and
oxygen atoms (in greenish blue).
In particular, complex oxygen emission features are seen
above and below the main nebula to a degree not detected
in most images of M76.
Distance estimates place M76 about 3 to 5 thousand light-years away
toward the heroic constellation
Perseus,
making the nebula over a
light-year in diameter.
APOD: 2008 June 26 - M27: Not A Comet
Explanation:
Born on June 26th in 1730,
astronomer Charles Messier scanned 18th century French skies
for comets.
To avoid confusion and aid his comet hunting, he
diligently recorded this object as number 27 on
his
list of things which are definitely not comets.
In fact, 21st century astronomers would classify it as a
Planetary
Nebula, but it's not a planet either, even though it may
appear round
and planet-like in a small telescope.
Messier 27 (M27) is now
known to be an excellent example of a
gaseous emission nebula created
as a sun-like star runs out
of nuclear fuel in its core.
The nebula forms as the star's outer layers are expelled into
space, with a visible glow generated by atoms excited by the dying
star's intense but invisible
ultraviolet light.
Known by the popular name of the
Dumbbell
Nebula, the beautifully
symmetric interstellar gas cloud is over 2.5 light-years across and
about 1,200 light-years away in the
constellation
Vulpecula.
This impressive color composite highlights subtle jet
features in the nebula.
It was recorded with a robotic
telescope sited in Hawaii using narrow band
filters sensitive to emission from oxygen atoms (shown in
green) and hydrogen atoms.
The hydrogen
emission is
seen as red (H-alpha) and fainter
bluish hues (H-beta).
APOD: 2006 November 2 - Messier 76
Explanation:
"Nebula at the right foot
of
Andromeda ... " begins the description
for the 76th object in Charles Messier's 18th century Catalog
of
Nebulae and Star Clusters.
In fact, M76 is
one of the fainter objects on the Messier list and
is also known by the popular name of the "Little Dumbbell Nebula".
Like its brighter namesake M27
(the Dumbbell Nebula), M76 is recognized
as a planetary
nebula - a gaseous shroud cast off by a
dying sunlike star.
The nebula itself is thought to be shaped more like a donut, while its
box-like appearance is
due to our nearly edge-on view.
Gas expanding more rapidly away from the donut hole produces the
faint loops of far flung material.
The nebula's dying star can be picked out in
this sharp color image as
the bottom, blue-tinted member of the double star near the center
of the box-like shape.
Distance estimates place M76 about 3 to 5 thousand light-years away,
making the nebula over a
light-year in diameter.
APOD: 2006 August 3 - M27: Not A Comet
Explanation:
While searching the skies above 18th century France for comets,
astronomer Charles Messier diligently recorded this object
as number 27 on his list of things which are
definitely not comets.
So what is it?
Well, 20th century astronomers would classify it as a
Planetary
Nebula ...
but it's not a planet either, even though it may
appear round
and planet-like in a small telescope.
Messier 27 (M27) is now
known to be an excellent example of a
gaseous emission nebula created
as a sun-like star runs out
of nuclear fuel in its core.
The nebula forms as the star's outer layers are expelled into
space, with a visible glow generated by atoms excited by the dying
star's intense but invisible
ultraviolet light.
Known by the popular name of the
Dumbbell
Nebula, the beautifully
symmetric interstellar gas cloud is about 1,200 light-years away in the
constellation
Vulpecula.
This intriguing
color composite
view was recorded through narrow band
filters sensitive to emission from hydrogen atoms (shown in red)
and oxygen atoms (shown in blue/green).
APOD: 2005 June 3 - M27: The Dumbbell Nebula
Explanation:
The first hint of what will become of our
Sun was discovered inadvertently in
1764.
At that time,
Charles Messier was compiling a list
of diffuse objects not to be confused with comets.
The 27th object on
Messier's list, now known as
M27 or the Dumbbell Nebula, is a
planetary nebula,
the type of nebula our Sun
will produce when
nuclear fusion stops in its core.
M27 is one of the brightest
planetary nebulae on the sky,
and can be seen in the constellation Vulpecula with binoculars.
It takes light about 1000 years to reach us from M27,
shown above, digitally sharpened, in three standard colors.
Understanding the physics and significance of
M27
was well beyond 18th century science.
Even today, many things remain mysterious about
bipolar planetary nebula like
M27, including the physical mechanism that expels a
low-mass star's gaseous outer-envelope, leaving an
X-ray hot
white dwarf.
APOD: 2004 April 24 - M27: Not A Comet
Explanation:
While searching the skies above 18th century France for comets,
astronomer Charles Messier diligently
recorded this object as number 27 on his list of things which are
definitely not comets.
So what is it?
Well, 21st century astronomers would classify it as a
Planetary
Nebula ...
but it's not a planet either, even though it may
appear round
and planet-like in a small telescope.
Messier 27 (M27) is now
known to be an excellent example of a
gaseous emission nebula created
as a sun-like star runs out
of nuclear fuel in its core.
The nebula forms as the star's outer layers are expelled into
space.
The visible glow is generated as atoms are excited by the dying
star's intense but invisible
ultraviolet light.
Known by the popular name
Dumbbell
Nebula, the beautifully
symmetric interstellar gas cloud is about 1,200 light-years away in the
constellation
Vulpecula.
This
gorgeous synthetic color picture of M27
was produced during testing of one of the European Southern Observatory's
Very
Large Telescopes.
APOD: 2003 July 25 - Dumbbell Nebula Halo
Explanation:
In 1764, French astronomer
Charles
Messier sighted this gorgeous
cosmic cloud which
he
described as an oval nebula without stars.
Cataloged as M27,
it is now popularly known as the
Dumbbell
Nebula, not for its substandard academic performance but
for the elongated shape, like a bar with weights on each end, which
first
caught Messier's eye.
This deep image of the bright planetary
nebula does reveal the Dumbell's central star though, and
an array of foreground and background stars
toward the sly constellation
Vulpecula.
The picture is
a composite
that includes 8 hours of
exposure through a filter designed to record only the light
of hydrogen atoms, tracing the intricate details of
the nebula's faint outer halo
which spans light-years.
Thought to be an example of the
fate awaiting our own
Sun 5 billion years hence, the Dumbbell Nebula is
about 1,200 light-years away.
APOD: 2003 February 11 - Dumbbell Nebula Close Up from Hubble
APOD: 2003 January 13 - The Dumbbell Nebula in Hydrogen and Oxygen
APOD: 2002 March 2 - M27: Not A Comet
APOD: 2001 March 6 - M27: The Dumbbell Nebula
APOD: October 23, 1999 - M27: Not A Comet
APOD: October 13, 1998 - In the Center of the Dumbbell Nebula
APOD: October 9, 1998 - M27: Not A Comet
APOD: February 18, 1998 - M27: The Dumbbell Nebula
APOD: July 29, 1995 - M27: The Dumbbell Nebula
Explanation:
What causes unusual knots of gas and dust in
planetary nebulas?
Seen previously in the
Ring Nebula, the
Helix
Nebula, and the
Eskimo Nebula,
the knots' existence was not predicted previously
and still not well understood.
Pictured above is a
Explanation:
The first hint of what will become of our
Sun was discovered inadvertently in 1764.
At that time,
Charles Messier was compiling a list
of "annoying" diffuse objects not to be confused with
"interesting" comets.
The 27th object on
Messier's list, now known as
M27 or the Dumbbell Nebula, is a
planetary nebula,
the type of nebula our Sun
will produce when
nuclear fusion stops in its core.
M27 is one of the brightest
planetary nebulae on the sky,
and can be seen in the constellation
Vulpecula with binoculars.
It takes light about 1000 years to reach us from M27,
shown above, digitally sharpened, in three isolated colors emitted by
hydrogen and
oxygen.
Understanding the physics and significance of
M27 was well
beyond 18th century science.
Even today, many things remain mysterious about
bipolar planetary nebula like
M27, including the physical mechanism that expels a
low-mass star's gaseous outer-envelope, leaving an
X-ray hot
white dwarf.
Explanation:
While searching the skies above 18th century France for comets,
astronomer Charles Messier diligently recorded this object
as number 27 on his list of things which are
definitely not comets.
So what is it?
Well, 20th century astronomers would classify it as a
Planetary
Nebula ...
but it's not a planet either, even though it may
appear round
and planet-like in a small telescope.
Messier 27 (M27) is now
known to be an excellent example of a
gaseous emission nebula created
as a sun-like star runs out
of nuclear fuel in its core.
The nebula forms as the star's outer layers are expelled into
space, with a visible glow generated by atoms excited by the dying
star's intense but invisible
ultraviolet light.
Known by the popular name of the
Dumbbell
Nebula, the beautifully
symmetric interstellar gas cloud is about 1,200 light-years away in the
constellation Vulpecula.
This
gorgeous synthetic color picture of M27
was produced during testing of one of the European Southern Observatory's
Very Large Telescopes.
Explanation:
The first hint of what will become of our
Sun was discovered inadvertently in 1764.
At that time,
Charles Messier was compiling a list
of "annoying" diffuse objects not to be confused with
"interesting" comets.
The 27th object on
Messier's list, now known as
M27 or the Dumbbell Nebula, is a
planetary nebula,
the type of nebula our Sun
will produce when
nuclear fusion stops in its core.
M27 is one of the brightest
planetary nebulae on the sky,
and can be seen in the constellation
Vulpecula with binoculars.
It takes light about 1000 years to reach us from M27,
shown above in representative colors.
Understanding the physics and significance of
M27 was well
beyond 18th century science.
Even today, many things remain mysterious about
bipolar planetary nebula like
M27, including the physical mechanism that expels a
low-mass star's gaseous outer-envelope, leaving an
X-ray hot
white dwarf.
Explanation:
While searching the skies above 18th century France for comets,
astronomer Charles Messier diligently recorded this object
as number 27 on his list of things which are
definitely not comets.
So what is it?
Well, 20th century astronomers would classify it as a
Planetary Nebula ...
but it's not a planet either, even though it may
appear round
and planet-like in a small telescope.
Messier 27 (M27) is now
known to be an excellent example of
a gaseous emission nebula created
as a sun-like star runs out
of nuclear fuel in its core.
The nebula forms as the star's outer layers are expelled into
space, with a visible glow generated by atoms excited by the dying
star's intense but invisible
ultraviolet light.
Known by the popular name of
the "Dumbbell Nebula", the beautifully
symmetric interstellar gas cloud is about 1,200 light-years away in the
constellation Vulpecula.
This gorgeous synthetic color picture of M27
was produced during testing of one of the European Southern Observatory's
Very Large Telescopes.
Explanation:
Here's part of the
Dumbbell Nebula that you can't see through
binoculars.
To see this, we suggest a
sophisticated spectrograph attached to a
telescope with an 8-meter aperture.
Pictured above is the central part of the
Dumbbell Nebula, also known as
M27 and NGC 6853.
The Dumbbell is a
planetary nebula created by the
aging bright star visible just right of center.
The nebula, located in the constellation Vulpecula, is thousands of years old.
Visible in
this false-color photograph
is glowing hydrogen gas (green) and
enigmatical globules of dense molecular gas and
dust (red).
Explanation:
While searching the skies above 18th century France for comets,
astronomer Charles Messier diligently recorded this object
as number 27 on his list of things which are
definitely not comets.
So what is it?
Well, 20th century astronomers would classify it as a
Planetary Nebula ...
but it's not a planet either, even though it may
appear round
and planet-like in a small telescope.
Messier 27 (M27) is now
known to be an excellent example of
a gaseous emission nebula created
as a sun-like star runs out
of nuclear fuel in its core.
The nebula forms as the star's outer layers are expelled into
space, with a visible glow generated by atoms excited by the dying
star's intense but invisible
ultraviolet light.
Known by the popular name of
the "Dumbbell Nebula", the beautifully
symmetric interstellar gas cloud is about 1,200 light-years away in the
constellation Vulpecula.
This gorgeous synthetic color picture of M27
was produced during testing of the European Southern Observatory's new
Very Large Telescope.
Explanation:
The first hint of what will become of our Sun was discovered inadvertently in 1764.
At that time, Charles Messier was compiling a list of
"annoying" diffuse objects not to be confused with
"interesting" comets. The 27th object on
Messier's list,
now known as M27 or the
Dumbbell Nebula, is a
planetary nebula,
the type of nebula our
Sun will produce when
nuclear fusion stops in its core. M27 is one of the brightest
planetary nebulae on the sky, and
can be seen in the constellation
Vulpecula with binoculars.
It takes light about 1000 years to reach us from M27.
Understanding the physics and significance of M27 was well beyond 18th century science.
Even today, many things remain mysterious about
bipolar planetary nebula
like M27, including the physical mechanism that
expels a low-mass star's gaseous outer-envelope,
leaving an
X-ray hot
white dwarf.
Explanation:
The Dumbbell Nebula is a beautiful red and blue planetary nebula in the
constellation of Vulpecula. It is the 27th object on
Charles Messier's
list of diffuse sky objects,
and so is referred to as M27.
Its high surface brightness makes it
a good target for small telescopes.
The term planetary nebula, used
to describe this general class of objects, is misleading.
Although these objects may appear round and
planet-like in small telescopes,
astronomers have determined them to be
stars surrounded by cocoons of gas blown off
in the late stages of evolution.
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Today's Astronomy Picture of the Day