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@celestialreconnaissance
This spectacular sight is of the Large Magellenic Cloud in the southern hemisphere. This composite highlights gas clouds (which we can’t see with our naked eye from Earth) so it looks like random bubbles of gas all over in brilliant colors.
Retrieved from:
NASA APOD
The Pleiades [5000 x 3649]
Fluttering flour
A wonderful satellite photo taken over Alaska illustrates well two geological phenomena, rock flour and Katabatic winds. The former is the finely ground mulch left behind by melting glaciers that colours glacial lakes blue (seen in the photo where the river estuaries meet the sea and the flour diffuses)and braided streams running out of the melt front an ashy grey brown. It is a very light powder consisting of tiny rock particles, the final product of the grinding and scouring of the Earth’s surface by many tons of ice. The dust plume in the image is made of this flour, carried by a particular kind of wind that blows off the world’s high places, including plateaus, mountain chains and ice sheets.
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The Pan-STARRS observatory has recorded this view of the astronomical sky. Credit: R. White (STScI), PSI Science Consortium.
The STS-134 external fuel tank is seen during its release from space shuttle Endeavour in space following the successful launch on May 16, 2011. An STS-134 crew member using a hand-held still camera took the image. – May 16, 2011 [3032 x 2008]
Celestial Headstones
A Planetary Nebula marks the end of a star’s life. They form when a star uses up all of the hydrogen in its core, an event our Sun will go through in about five billion years.
See More Images Of Celestial Nebulae
As it’s life draws to a close, the star begins to cool and expand, increasing its radius by tens to hundreds of times its original size. Eventually, the outer layers of the star are carried away by a 50,000 kilometer per hour wind, leaving behind a hot core. This hot core has a surface temperature of about 50,000 degrees Celsius, and is ejecting its outer layers in a much faster wind traveling six million kilometers per hour. The radiation from the hot star and the interaction of its fast wind with the slower wind creates the complex and filamentary shell of a planetary nebula. Eventually the remnant star will collapse to form a white dwarf star, which are found at the center of these nebulae.
Planetary nebulae may play a crucial role in the chemical evolution of the Milky Way, returning material to the interstellar medium from stars where elements, such as carbon, nitrogen, oxygen and neon, have been created. Planetary nebulae are also observed in more distant galaxies, yielding useful information about their chemical abundances.
Images above courtesy of NASA & ESA
Visit our website: www.ScienceSource.com
A Circumhorizontal Arc Over Ohio . Image Credit & Copyright: Todd Sladoje . Why would clouds appear to be different colors? The reason here is that ice crystals in distant cirrus clouds are acting like little floating prisms. Sometimes known as a fire rainbow for its flame-like appearance, a circumhorizon arc lies parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds are present. Furthermore, the numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are quite unusual to see. This circumhorizon display was photographed through a polarized lens above Dublin, Ohio in 2009. https://go.nasa.gov/2HxzFFm via Instagram http://bit.ly/2VND9xA
I’m back.
“I’m not afraid of death, but I’m in no hurry to die. I have so much I want to do first.”
And he did so much. He became an evershining star for humankind to look up to. Rest in peace.
Time And Space
Halley’s Comet, March 8, 1986, observed from Easter Island by W. Liller.
ISS shadow transit approaching Mare Vaporum [2018 Mar 03] Found here
The Aurora Borealis. Photo by Andrew Cameron. .
js
Swirls of Jupiter
Jupiter is a very stormy, turbulent, violent planet. The planet completes a day (or one complete rotation) within roughly 10 hours, which creates massive winds, producing these swirls, and violent storms. The fast rotation coupled with the fact that the planet is nothing but gas greatly multiplies the Coriolis effect. Earth too has a Coriolis effect, this creates the characteristic hurricane shapes and also contributes to the fact that storms will spin the opposite direction in different hemispheres. Luckily, our rotation is slower - our storms are less frequent and less violent than they would be if our days were shorter.
The above images come from the recent Juno mission by NASA.
V838 Monocerotis stages of expansion beginning from May 2002 to October 2004
by MegaBond (via reddit)
Transit of Venus in 2012
Credit: NASA / SDO
Jupiter: South Pole.
Jupiter via Juno by NASA - more to come.
2018 January 9
Bright Planetary Nebula NGC 7027 from Hubble Image Credit: Hubble, NASA, ESA; Processing & License: Judy Schmidt
Explanation: It is one of the brightest planetary nebulae on the sky – what should it be named? First discovered in 1878, nebula NGC 7027 can be seen toward the constellation of the Swan (Cygnus) with a standard backyard telescope. Partly because it appears there as only an indistinct spot, it is rarely referred to with a moniker. When imaged with the Earth-orbiting Hubble Space Telescope, however, great details are revealed. Studying Hubble images of NGC 7027 have led to the understanding that it is a planetary nebula that began expanding about 600 years ago, and that the cloud of gas and dust is unusually massive as it appears to contain about three times the mass of our Sun. Pictured here in assigned colors, the resolved, layered, and dust-laced features of NGC 7027 might remind sky enthusiasts of a familiar icon that could be the basis for an informal name. A leading previous suggestion was the Pillow Nebula, but please feel free to make new suggestions – for example, in an online APOD discussion forum.
∞ Source: apod.nasa.gov/apod/ap180109.html
