Astronomy Picture of the Day (APOD)
01-25-2018, 09:04 AM,
RE: Astronomy Picture of the Day (APOD)
Cartwheel of Fortune

[Image: cartwheel_hst1024.jpg]

APOD Wrote:Explanation: By chance, a collision of two galaxies has created a surprisingly recognizable shape on a cosmic scale, The Cartwheel Galaxy. The Cartwheel is part of a group of galaxies about 500 million light years away in the constellation Sculptor. Two smaller galaxies in the group are visible on the right. The Cartwheel Galaxy's rim is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. When galaxies collide they pass through each other, their individual stars rarely coming into contact. Still, the galaxies' gravitational fields are seriously distorted by the collision. In fact, the ring-like shape is the result of the gravitational disruption caused by a small intruder galaxy passing through a large one, compressing the interstellar gas and dust and causing a a star formation wave to move out from the impact point like a ripple across the surface of a pond. In this case the large galaxy may have originally been a spiral, not unlike our own Milky Way, transformed into the wheel shape by the collision. But ... what happened to the small intruder galaxy?

Source: APOD, 2018 January 25

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01-27-2018, 08:06 AM,
RE: Astronomy Picture of the Day (APOD)
Laguna Starry Sky

[Image: YuriAndLagunas_KLH1024.jpg]

APOD Wrote:Explanation: Staring toward the heavens, one of the many lagunas in the Atacama Desert salt flat calmly reflects a starry night sky near San Pedro de Atacama, Chile, planet Earth. Cosmic rifts of dust, star clouds, and nebulae of the central Milky Way galaxy are rising in the east, beyond a volcanic horizon. Caught in the six frame panorama serenely recorded in the early morning hours of January 15, planets Jupiter and Mars are close. Near the ecliptic, the bright planets are immersed in the Solar System's visible band of Zodiacal light extending up and left from the galactic center. Above the horizon to the south (right) are the Large and Small clouds of Magellan, satellite galaxies of the Milky Way.  

Source: APOD, 2018 January 27

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01-28-2018, 07:12 AM, (This post was last modified: 01-28-2018, 07:12 AM by Nía.)
RE: Astronomy Picture of the Day (APOD)



Source: APOD, 2018 January 28

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01-30-2018, 09:36 AM,
RE: Astronomy Picture of the Day (APOD)
Venus at Night in Infrared from Akatsuki

[Image: VenusNight_AkatsukiBouic_960.jpg]

APOD Wrote:Explanation: Why is Venus so different from Earth? To help find out, Japan launched the robotic Akatsuki spacecraft which entered orbit around Venus late in 2015 after an unplanned five-year adventure around the inner Solar System. Even though Akatsuki was past its original planned lifetime, the spacecraft and instruments were operating so well that much of its original mission was reinstated. Also known as the Venus Climate Orbiter, Akatsuki's instruments investigated unknowns about Earth's sister planet, including whether volcanoes are still active, whether lightning occurs in the dense atmosphere, and why wind speeds greatly exceed the planet's rotation speed. In the featured image taken by Akatsuki's IR2 camera, Venus's night side shows a jagged-edged equatorial band of high dark clouds absorbing infrared light from hotter layers deeper in Venus' atmosphere. The bright orange and black stripe on the upper right is a false digital artifact that covers part of the much brighter day side of Venus. Analyses of Akatsuki images and data has shown that Venus has equatorial jet similar to Earth's jet stream.  

Source: APOD, 2018 January 30

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02-01-2018, 04:05 PM,
RE: Astronomy Picture of the Day (APOD)
Moonset Eclipse

[Image: TLE2018Jan31-1167w.jpg]

Source: APOD, 2018 February 01

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02-02-2018, 09:18 AM,
RE: Astronomy Picture of the Day (APOD)
Moonrise Eclipse

[Image: 20180131TrisulTLE424_1043.jpg]

Source: APOD, 2018 February 02

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02-04-2018, 05:24 PM,
RE: Astronomy Picture of the Day (APOD)
Venus and the Triply Ultraviolet Sun

[Image: SunVenusUv3_SdoDove_960.jpg]

APOD Wrote:Explanation: An unusual type of solar eclipse occurred in 2012. Usually it is the Earth's Moon that eclipses the Sun. That year, most unusually, the planet Venus took a turn. Like a solar eclipse by the Moon, the phase of Venus became a continually thinner crescent as Venus became increasingly better aligned with the Sun. Eventually the alignment became perfect and the phase of Venus dropped to zero. The dark spot of Venus crossed our parent star. The situation could technically be labeled a Venusian annular eclipse with an extraordinarily large ring of fire. Pictured here during the occultation, the Sun was imaged in three colors of ultraviolet light by the Earth-orbiting Solar Dynamics Observatory, with the dark region toward the right corresponding to a coronal hole. Hours later, as Venus continued in its orbit, a slight crescent phase appeared again. The next Venusian transit across the Sun will occur in 2117.

Source: APOD, 2018 February 04

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02-05-2018, 01:22 PM,
RE: Astronomy Picture of the Day (APOD)
NGC 7635: The Bubble Nebula Expanding

[Image: Bubble_LiverpoolNilsson_960.jpg]

Source: APOD, 2018 February 05

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02-06-2018, 08:07 AM,
RE: Astronomy Picture of the Day (APOD)
Galaxy NGC 474: Shells and Star Streams

[Image: NGC474_CfhtCoelum_960.jpg]

APOD Wrote:Explanation: What's happening to galaxy NGC 474? The multiple layers of emission appear strangely complex and unexpected given the relatively featureless appearance of the elliptical galaxy in less deep images. The cause of the shells is currently unknown, but possibly tidal tails related to debris left over from absorbing numerous small galaxies in the past billion years. Alternatively the shells may be like ripples in a pond, where the ongoing collision with the spiral galaxy just above NGC 474 is causing density waves to ripple through the galactic giant. Regardless of the actual cause, the featured image dramatically highlights the increasing consensus that at least some elliptical galaxies have formed in the recent past, and that the outer halos of most large galaxies are not really smooth but have complexities induced by frequent interactions with -- and accretions of -- smaller nearby galaxies. The halo of our own Milky Way Galaxy is one example of such unexpected complexity. NGC 474 spans about 250,000 light years and lies about 100 million light years distant toward the constellation of the Fish (Pisces).

Source: APOD, 2018 February 06

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02-07-2018, 10:09 AM,
RE: Astronomy Picture of the Day (APOD)
NGC 7331 Close-Up

[Image: potw1805a_ngc7331S1024.jpg]

Source: APOD, 2018 February 07

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02-09-2018, 01:52 PM,
RE: Astronomy Picture of the Day (APOD)
Total Solar Lunar Eclipse

[Image: MoonTwoEclipse960.jpg]

APOD Wrote:Explanation: This digitally processed and composited picture creatively compares two famous eclipses in one; the total lunar eclipse (left) of January 31, and the total solar eclipse of August 21, 2017. The Moon appears near mid-totality in both the back-to-back total eclipses. In the lunar eclipse, its surface remains faintly illuminated in Earth's dark reddened shadow. But in the solar eclipse the Moon is in silhouette against the Sun's bright disk, where the otherwise dark lunar surface is just visible due to earthshine. Also seen in the lunar-aligned image pair are faint stars in the night sky surrounding the eclipsed Moon. Stunning details of prominences and coronal streamers surround the eclipsed Sun. The total phase of the Great American Eclipse of August 21 lasted about 2 minutes or less for locations along the Moon's shadow path. From planet Earth's night side, totality for the Super Blue Blood Moon of January 31 lasted well over an hour.

Source: APOD, 2018 February 09

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02-14-2018, 08:38 AM,
RE: Astronomy Picture of the Day (APOD)
In the Heart of the Heart Nebula

[Image: HeartBiColor_Erickson_960.jpg]

Source: APOD, 2018 February 14

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02-16-2018, 05:35 AM,
RE: Astronomy Picture of the Day (APOD)
Comet PanSTARRS is near the Edge

[Image: 105flatsMcDonald_CaliforniaSistersComet1024.jpg]

APOD Wrote:Explanation: The comet PanSTARRS, also known as the blue comet (C/2016 R2), really is near the lower left edge of this stunning, wide field view recorded on January 13. Spanning nearly 20 degrees on the sky, the cosmic landscape is explored by well-exposed and processed frames from a sensitive digital camera. It consists of colorful clouds and dusty dark nebulae otherwise too faint for your eye to see, though. At top right, the California Nebula (aka NGC 1499) does have a familiar shape. Its coastline is over 60 light-years long and lies some 1,500 light-years away. The nebula's pronounced reddish glow is from hydrogen atoms ionized by luminous blue star Xi Persei just below it. Near bottom center, the famous Pleiades star cluster is some 400 light-years distant and around 15 light-years across. Its spectacular blue color is due to the reflection of starlight by interstellar dust. In between are hot stars of the Perseus OB2 association and dusty, dark nebulae along the edge of the nearby, massive Taurus and Perseus molecular clouds. Emission from unusually abundant ionized carbon monoxide (CO+) molecules fluorescing in sunlight is largely responsible for the telltale blue tint of the remarkable comet's tail. The comet was about 17 light minutes from Earth. ?

Source: APOD, 2018 February 16

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02-16-2018, 05:38 AM,
RE: Astronomy Picture of the Day (APOD)
[Image: pilot-clouds-lightning-night-skies-santi...9__880.jpg]

Estimated first "legit" photo of a city and its lights on Proxima Centauri b, camera technology by CCP games.
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02-16-2018, 05:41 AM, (This post was last modified: 02-16-2018, 06:08 AM by Cyan. Edit Reason: When Ouja meets Windpower )
RE: Astronomy Picture of the Day (APOD)
[Image: pilot-clouds-lightning-night-skies-santi...6__880.jpg]

Estimated EM static echo between Columbia and Ecuador from wind power generation, was supposed to be a 5th category hurricane, local use of wind power seemed to turn it into that, seems a echo artifact of the war they had in the 1860's, locals treat it like a party float, have no problem approaching to within meters of its core. Nice pictures in series.

[Image: kmnun63.png]
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02-16-2018, 03:07 PM,
RE: Astronomy Picture of the Day (APOD)
Jupiter’s Swirling Cloud Formations

[Image: pia21978-opt.jpg]

Source: NASA Image of the Day, 2018 February 16

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02-17-2018, 05:27 AM,
RE: Astronomy Picture of the Day (APOD)
[Image: MyCn18.jpg]

[Image: wallpaper-hourglass-nebula.jpg]

[Image: hourglass_galaxy.jpg]
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02-18-2018, 02:55 PM,
RE: Astronomy Picture of the Day (APOD)
LL Ori and the Orion Nebula

[Image: LLOri_hubble_960.jpg]

APOD Wrote:Explanation: Stars can make waves in the Orion Nebula's sea of gas and dust. This esthetic close-up of cosmic clouds and stellar winds features LL Orionis, interacting with the Orion Nebula flow. Adrift in Orion's stellar nursery and still in its formative years, variable star LL Orionis produces a wind more energetic than the wind from our own middle-aged Sun. As the fast stellar wind runs into slow moving gas a shock front is formed, analogous to the bow wave of a boat moving through water or a plane traveling at supersonic speed. The small, arcing, graceful structure just above and left of center is LL Ori's cosmic bow shock, measuring about half a light-year across. The slower gas is flowing away from the Orion Nebula's hot central star cluster, the Trapezium, located off the upper left corner of the picture. In three dimensions, LL Ori's wrap-around shock front is shaped like a bowl that appears brightest when viewed along the "bottom" edge. This beautiful painting-like photograph is part of a large mosaic view of the complex stellar nursery in Orion, filled with a myriad of fluid shapes associated with star formation.

Source: APOD, 2018 February 18

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02-19-2018, 10:48 AM,
RE: Astronomy Picture of the Day (APOD)
Galaxy Formation in a Magnetic Universe



APOD Wrote:Explanation: How did we get here? We know that we live on a planet orbiting a star orbiting a galaxy, but how did all of this form? To understand details better, astrophysicists upgraded the famous Illustris Simulation into IllustrisTNG -- now the most sophisticated computer model of how galaxies evolved in our universe. Specifically, this featured video tracks magnetic fields from the early universe (redshift 5) until today (redshift 0). Here blue represents relatively weak magnetic fields, while white depicts strong. These B fields are closely matched with galaxies and galaxy clusters. As the simulation begins, a virtual camera circles the virtual IllustrisTNG universe showing a young region -- 30-million light years across -- to be quite filamentary. Gravity causes galaxies to form and merge as the universe expands and evolves. At the end, the simulated IllustrisTNG universe is a good statistical match to our present real universe, although some interesting differences arise -- for example a discrepancy involving the power in radio waves emitted by rapidly moving charged particles.

Source: APOD, 2018 February 19

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02-22-2018, 07:05 AM,
RE: Astronomy Picture of the Day (APOD)
When Roses Aren't Red

[Image: RosetteNebulaNBHColesHelm1024.jpg]

APOD Wrote:Explanation: Not all roses are red of course, but they can still be very pretty. Likewise, the beautiful Rosette Nebula and other star forming regions are often shown in astronomical images with a predominately red hue, in part because the dominant emission in the nebula is from hydrogen atoms. Hydrogen's strongest optical emission line, known as H-alpha, is in the red region of the spectrum, but the beauty of an emission nebula need not be appreciated in red light alone. Other atoms in the nebula are also excited by energetic starlight and produce narrow emission lines as well. In this gorgeous view of the Rosette Nebula, narrowband images are combined to show emission from sulfur atoms in red, hydrogen in blue, and oxygen in green. In fact, the scheme of mapping these narrow atomic emission lines into broader colors is adopted in many Hubble images of stellar nurseries. The image spans about 100 light-years in the constellation Monoceros, at the 3,000 light-year estimated distance of the Rosette Nebula. To make the Rosette red, just follow this link.

Source: APOD, 2018 February 22

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