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Mark A. Holmes

Megrez's position at the base of the Great Bear's tail seems to be indicative of
its influence.


Mark A. Holmes

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Mark A. Holmes

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Mark A. Holmes

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Mark A. Holmes

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Mark A. Holmes

http://apod.nasa.gov/apod/ap111111.html

The spiral galaxy M-83 in Hydra.


Mark A. Holmes

http://apod.nasa.gov/apod/ap111113.html

NGC 6302, the Butterfly Nebula in Scorpius.


Mark A. Holmes

http://apod.nasa.gov/apod/ap111116.html

NGC 7822, an emission nebula in Cepheus.


Mark A. Holmes

http://apod.nasa.gov/apod/ap111117.html

"This cosmic vista stretches almost 20 degrees across the gentle constellation
Taurus. It begins at the Pleiades and ends at the Hyades, two of the best known
star clusters in planet Earth's sky. At left, the lovely Pleiades star cluster
is about 400 light-years away. In a familiar celestial scene, the cluster stars
shine through dusty clouds that scatter blue starlight. At right, the V-shaped
Hyades cluster looks more spread out compared to the compact Pleiades and lies
much closer, 150 light-years distant. Of course, the Hyades cluster stars seem
anchored by bright Aldebaran, a red giant star with a yellowish appearance. But
Aldebaran actually lies only 65 light-years away, by chance along the line of
sight to the Hyades cluster. Faint dust clouds found near the edge of the Taurus
Molecular Cloud are also evident throughout the remarkable 12 panel mosaic. The
wide field of view includes the youthful star T Tauri and Hind's variable nebula
about four degrees left of Aldebaran on the sky."


Mark A. Holmes

A list of 158 deep-sky objects compiled by Canadian astronomer Sidney van den
Bergh.

http://www.astronomy.com/~/media/Files/PDF/Web_Extras/Import/van_den_bergh_catal\
og.ashx


Mark

http://apod.nasa.gov/apod/ap111119.html

Barnard 175, a dark nebula in Cepheus known as the Wolf's Cave, including a
mysterious blue reflection nebula called Van den Bergh (VdB) 152 (or Cedarblad
201; but I think I'll go with the first name).


Mark A. Holmes

--- In the_eclipses@yahoogroups.com, "mahtezcatpoc" <mahtezcatpoc@...> wrote:
>
> At 6:09 am UT at 2 Sagittarius 36.
>
> It belongs to Saros series 14 North.


Aligned with


Lucida Circini (Alpha Circini)
Circinus Pulsar (PSR B1509-58 Circini; supernova remnant)
Kajam (Omega Herculis)
Aedes (Iota-1 Muscae)
Keyhole Planetary (MRSL 252 Normae; nebulae)
Yed Prior (Delta Ophiuchi)
Acrab (Beta Scorpii)
Isidis (Delta Scorpii)
Vrischika (Pi Scorpii)
Fang (Rho Scorpii)

Mark A. Holmes

http://apod.nasa.gov/apod/ap111120.html

"How do stars form? A study of star forming region W5 by the sun-orbiting
Spitzer Space Telescope provides clear clues by recording that massive stars
near the center of empty cavities are older than stars near the edges. A likely
reason for this is that the older stars in the center are actually triggering
the formation of the younger edge stars. The triggered star formation occurs
when hot outflowing gas compresses cooler gas into knots dense enough to
gravitationally contract into stars. Spectacular pillars, left slowly
evaporating from the hot outflowing gas, provide further visual clues. In the
above scientifically-colored infrared image, red indicates heated dust, while
white and green indicate particularly dense gas clouds. W5 is also known as IC
1848, and together with IC 1805 form a complex region of star formation
popularly dubbed the Heart and Soul Nebulas. The above image highlights a part
of W5 spanning about 2,000 light years that is rich in star forming pillars. W5
lies about 6,500 light years away toward the constellation of Cassiopeia."


Mark A. Holmes

http://apod.nasa.gov/apod/ap111124.html

"In this artist's illustration, two distant galaxies formed about 2 billion
years after the big bang are caught in the afterglow of GRB090323, a gamma-ray
burst seen across the Universe. Shining through its own host galaxy and another
nearby galaxy, the alignment of gamma-ray burst and galaxies was inferred from
the afterglow spectrum following the burst's initial detection by the Fermi
Gamma Ray Space Telescope in March of 2009. As seen by one of the European
Southern Observatory's very large telescope units, the spectrum of the burst's
fading afterglow also offered a surprising result - the distant galaxies are
richer in heavy elements than the Sun, with the highest abundances ever seen in
the early Universe. Heavy elements that enrich mature galaxies in the local
Universe were made in past generations of stars. So these young galaxies have
experienced a prodigious rate of star formation and chemical evolution compared
to our own Milky Way. In the illustration, the light from the burst site at the
left passes successively through the galaxies to the right. Spectra illustrating
dark absorption lines of the galaxies' elements imprinted on the afterglow light
are shown as insets. Of course, astronomers on planet Earth would be about 12
billion light-years off the right edge of the frame."


Mark A. Holmes

http://apod.nasa.gov/apod/ap111126.html

IC 5067, the Pelican Nebula in Cygnus.


Mark A. Holmes

http://apod.nasa.gov/apod/ap111129.html


"A fantastic jumble of young blue star clusters, gigantic glowing gas clouds,
and imposing dark dust lanes surrounds the central region of the active galaxy
Centaurus A. This image from the Hubble Space Telescope has been processed to
present a natural color picture of this cosmic maelstrom. Infrared images from
the Hubble have also shown that hidden at the center of this activity are what
seem to be disks of matter spiraling into a black hole with a billion times the
mass of the Sun. Centaurus A itself is apparently the result of a collision of
two galaxies and the left over debris is steadily being consumed by the black
hole. Astronomers believe that such black hole central engines generate the
radio, X-ray, and gamma-ray energy radiated by Centaurus A and other active
galaxies. But for an active galaxy Centaurus A is close, a mere 10 million
light-years away, and is a relatively convenient laboratory for exploring these
powerful sources of energy."


Mark A. Holmes

Website: http://ye-stars.com

You're welcome.

Mark A. Holmes

--- In thefixedstars@yahoogroups.com, "Diana K Rosenberg" <fixed.stars@...>
wrote:
>
> Mark sent:
>
>  <http://apod.nasa.gov/apod/ap111120.html>
> http://apod.nasa.gov/apod/ap111120.html
>
> "How do stars form? A study of star forming region W5 by the sun-orbiting
> Spitzer Space Telescope provides clear clues by recording that massive stars
> near the center of empty cavities are older than stars near the edges. A
> likely reason for this is that the older stars in the center are actually
> triggering the formation of the younger edge stars. The triggered star
> formation occurs when hot outflowing gas compresses cooler gas into knots
> dense enough to gravitationally contract into stars. Spectacular pillars,
> left slowly evaporating from the hot outflowing gas, provide further visual
> clues. In the above scientifically-colored infrared image, red indicates
> heated dust, while white and green indicate particularly dense gas clouds.
> W5 is also known as IC 1848, and together with IC 1805 form a complex region
> of star formation popularly dubbed the Heart and Soul Nebulas. The above
> image highlights a part of W5 spanning about 2,000 light years that is rich
> in star forming pillars. W5 lies about 6,500 light years away toward the
> constellation of Cassiopeia."
>
> xxxxxxxxxxxx
>
> Epoch J2000.0:   1 Gemini 05
>
> Thank you, Mark!
>
> Love, Diana
>
> Website: http://ye-stars.com <http://ye-stars.com/>
>

http://apod.nasa.gov/apod/ap111204.html

"For reasons unknown, star V838 Mon's outer surface suddenly greatly expanded
with the result that it became the brightest star in the entire Milky Way Galaxy
in January 2002. Then, just as suddenly, it faded. A stellar flash like this has
never been seen before. It's true that supernovae and novae expel matter out
into space. But while the V838 Mon flash appears to expel material into space,
what is seen here is actually an outwardly moving light echo of the bright
flash. In a light echo, light from the flash is reflected by successively more
distant rings in the ambient interstellar dust that already surrounded the star.
V838 Mon lies about 20,000 light years away toward the constellation of
Monoceros the unicorn. In this Hubble Space Telescope image from February 2004,
the light echo is about six light years in diameter."


Mark A. Holmes

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Mark A. Holmes

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Mark A. Holmes