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Solar Flare from a Sharper Sun - Astronomy Picture of the Day for 22 Nov. 2014 "Solar active region AR2192 was the largest recorded sunspot group of the last 24 years. Before rotating off the Earth-facing side of the Sun at the end of October, it produced a whopping six energetic X-class flares. Its most intense flare was captured on October 24 in this stunning view from the orbiting Solar Dynamics Observatory. The scene is a color combination of images made at three different wavelengths of extreme ultraviolet light; 193 angstroms shown in blue, 171 angstroms in white, and 304 angstroms in red. The emission, from highly ionized Iron and Helium atoms, traces magnetic field lines looping through the hot plasma of the Sun’s outer chromosphere and corona. Beneath, the cooler solar photosphere appears dark at extreme ultraviolet wavelengths. The exceptionally sharp composite image has been processed with a new mathematical algorithm (NAFE) that adapts to noise and brightness in extreme ultraviolet image data to reliably enhance small details.” Image Credit: Solar Dynamics Observatory/AIA, NASA Processing: NAFE by Miloslav Druckmuller (Brno University of Technology) http://apod.nasa.gov/apod/ap141122.html
Star trails South, Charlestown, Cornwall by crowlem on Flickr.
Santa Rosa Creek Estuary & Moonstone Beach-California-Central-Coast 2014-11-22 by randyandy101 on Flickr.
The Milky Way in Stars and Dust Credit & Copyright: Serge Brunier
The Most Precise Signal in the Universe
"It’s an incredibly ambitious, far-fetched idea, as it requires cooling to temperatures on the order of picoKelvin just to measure the inherent width, and even lower than that (down to attoKelvin scales) if you want to measure realistic gravitational waves. Nevertheless, it’s a fantastic theoretical possibility, and one that could shed light on an otherwise invisible, undetectable phenomenon permeating our Universe!"
With every extra digit we add in our quest for absolute zero, more and more of the Universe becomes accessible to us. One of the holy grails of this will be to measure the inherent line width of the spin-flip transition of atomic hydrogen, perhaps the narrowest of all emission lines. If we can go even deeper than that, probing its structure over time, we could wind up seeing signatures of phenomena such as gravitational waves, a time-varying gravitational constant or black hole formation. We’re waiting on the experimentalists to get us there, but in theory, this is happening all the time.
How Can We Search For Life on Icy Moons Such as Europa?
By Elizabeth Howell
Our solar system is host to a wealth of icy worlds that may have water beneath the surface. The Cassini spacecraft recently uncovered evidence of a possible ocean under the surface of Saturn’s moon, Mimas.
Mimas is not alone in the possibility of having a global ocean, which would potentially provide a foothold for life to exist. Other worlds under examination include Jupiter’s moon, Europa. In 2013, NASA’s Hubble Space Telescope observed evidence that Europa erupts water, while the Cassini spacecraft has observed geysers spewing on Saturn’s moon, Enceladus.
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Lunar Eclipse • October 8, 2014 4:48AM PDT by victorvonsalza on Flickr.
Lookout to the Milky Way & Mars by Donegal Skies on Flickr.
Star trails Cherry Blossom Pond by Terry Aldhizer on Flickr.
vdB31 + Barnard 26, 27, 28 by yuriy.toropin on Flickr.
Kerry Reserve by Frank Ryan Astrophotography on Flickr.
m45-pleiades_6h25m_iso800_5mx_2048 by mediamousela on Flickr.
M77 H-alpha by geckzilla on Flickr.
Angel Rocks Aurora by Lee Petersen - lwpetersenphotography.com on Flickr.