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Apod

mbig

mbig

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APOD (Astronomy Picture Of the Day)

1 of app 5000 pics over 14 years.

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Rocket Trail at Sunset​

The above the 'small' jpg, 1/8 size, of the Full .... and Explanation here:

APOD: 2002 September 26 - Rocket Trail at Sunset


The daily Astronomy Picture of the Day


The archive of 1400 often Fantastic pictures Astronomy Picture of the Day Archive

searchable
APOD Text Search
 
The above are hand Chosen by me as to particular beauty.

This is Today's: April 17.
APOD: 2013 April 17 - Mt Hood and a Lenticular Cloud
Mt. Hood and a Lenticular Cloud
Image Credit & Copyright: Ben Canales
Explanation: What kind of cloud is next to that mountain? A lenticular. This type of cloud forms in air that passes over a mountain, rises up again, and cools past the dew point -- so what molecular water carried in the air condenses into droplets. The layered nature of some lenticular clouds may make them appear, to some, as large alien spaceships. In this case, the mountain pictured is Mt. Hood located in Oregon, USA. Lenticular clouds can only form when conditions are right -- for example this is first time this astrophotographer has seen a lenticular cloud at night near Mt. Hood. The above image was taken in mid-March about two hours before dawn.

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2013 April 19
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NGC 1788 and the Witch's Whiskers
 
[Two today for not being able to post yesterday]

2013 April 20 Airglow, Gegenschein, and Milky Way
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2013 April 21, The Big Dipper
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2013 April 23 X-rays from Supernova Remnant SN 1006
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Tails of Comet Lemmon @ APOD: 2013 May 6 - Tails of Comet Lemmon
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What caused the interestingly intricate tails that Comet Lemmon displayed earlier this year? What caused the interestingly intricate tails that Comet Lemmon displayed earlier this year?
 
May 29, 2013. http://apod.nasa.gov/apod/ap130529.html

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NGC 6960: The Witch's Broom Nebula
Image Credit & Copyright: Martin Pugh

Explanation: Ten thousand years ago, before the dawn of recorded human history, a new light would have suddenly have appeared in the night sky and faded after a few weeks. Today we know this light was from a supernova, or exploding star, and record the expanding debris cloud as the Veil Nebula, a supernova remnant. This sharp telescopic view is centered on a western segment of the Veil Nebula cataloged as NGC 6960 but less formally known as the Witch's Broom Nebula. Blasted out in the cataclysmic explosion, the interstellar shock wave plows through space sweeping up and exciting interstellar material. Imaged with narrow band filters, the glowing filaments are like long ripples in a sheet seen almost edge on, remarkably well separated into atomic hydrogen (red) and oxygen (blue-green) gas. The complete supernova remnant lies about 1400 light-years away towards the constellation Cygnus. This Witch's Broom actually spans about 35 light-years. The bright star in the frame is 52 Cygni, visible with the unaided eye from a dark location but unrelated to the ancient supernova remnant.​
 
My current desktop on superwide HP 34" AIO
APOD: 2013 November 15 - The Flash Spectrum of the Sun
Larger JPG at: http://apod.nasa.gov/apod/image/1311/emmanouilidi200mmFlashSpect.jpg)


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The Flash Spectrum of the Sun
Image Credit & Copyright: Constantine Emmanouilidi​

Explanation: In a flash, the visible spectrum of the Sun changed from absorption to emission on November 3rd, during the brief total phase of a solar eclipse. That fleeting moment is captured by telephoto lens and diffraction grating in this well-timed image from clearing skies over Gabon in equatorial Africa. With overwhelming light from the Sun's disk blocked by the Moon, the normally dominant absorption spectrum of the solar photosphere is hidden. What remains, spread by the diffraction grating into the spectrum of colors to the right of the eclipsed Sun, are individual eclipse images at each wavelength of light emitted by atoms along the thin arc of the solar chromosphere. The brightest images, or strongest chromospheric emission lines, are due to Hydrogen atoms that produce the red hydrogen alpha emission at the far right and blue hydrogen beta emission to the left. In between, the bright yellow emission image is caused by atoms of Helium, an element only first discovered in the flash spectrum of the Sun.
 
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