15 Flips | 5 Magazines | 1 Follower | @katrinacross | Keep up with Katrina on Flipboard, a place to see the stories, photos, and updates that matter to you. Flipboard creates a personalized magazine full of everything, from world news to life’s great moments. Download Flipboard for free and search for “Katrina”

APOD: A Supercell Thunderstorm Over Texas (2013 Jun 18) Video Credit & Copyright: Mike Olbinski; Music: Impact Lento (Kevin MacLeod, Incompetech) http://apod.nasa.gov/apod/fap/ap130618.html http://vimeo.com/67995158 Explanation: Is that a cloud or an alien spaceship? It's an unusual and sometimes dangerous type of thunderstorm cloud called a supercell. Supercells may spawn damaging tornados, hail, downbursts of air, or drenching rain. Or they may just look impressive. A supercell harbors a mesocyclone -- a rising column of air surrounded by drafts of falling air. Supercells could occur over many places on Earth but are particularly common in Tornado Alley of the USA. Pictured above are four time lapse sequences of a supercell rotating above and moving across Booker, Texas. Captured in the video are new clouds forming near the storm center, dust swirling on the ground, lightning flashing in the upper clouds, all while the impressively sculptured complex rotates ominously. Finally, after a few hours, as shown in the final sequence, dense rain falls as the storm begins to die out. http://gallery.mikeolbinski.com/ http://incompetech.com/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130618 #APOD

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Swirling, Psychedelic Self-Portraits by Nikos Gyftakis | Colossal

<p>Greek artist Nikos Gyftakis created this wonderful series of swirling self-portraits between 2004-2005. The works are made with oil pastels on …

APOD: Milky Way Over Crater Lake with Airglow (2013 Jun 19) Image Credit & Copyright: John H. Moore; Annotation: Judy Schmidt http://apod.nasa.gov/apod/ap130619.html Explanation: How many different astronomical phenomena have come together to create the above vista? Several. First, in the foreground, is Crater Lake -- a caldera created by volcanism on planet Earth about 7,700 years ago. Next, inside the lake, is water. Although the origin of the water in the crater is melted snowfall, the origin of water on Earth more generally is unclear, but possibly related to ancient Earthly-impacts of icy bodies. Next, the green glow in the sky is airglow, light emitted by atoms high in the Earth's atmosphere as they recombine at night after being separated during the day by energetic sunlight. The many points of light in the sky are stars, glowing by nuclear fusion. They are far above the atmosphere but nearby to our Sun in the Milky Way Galaxy. Finally, the bright arch across the image is the central band of the Milky Way, much further away, on the average, than the nearby stars, and shaped mostly by gravity. Contrary to appearances, the Milky Way band glows by itself and is not illuminated by the airglow. The above image is a six-frame panorama taken during about two weeks ago in Oregon, USA. http://johnhmoore.com/ http://geckzilla.com/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130619 Annotated Image: http://apod.nasa.gov/apod/image/1306/mwskyglow_moore_annotated_960.jpg #APOD

APOD: NGC 6960: The Witch's Broom Nebula (2013 May 29) Image Credit & Copyright: Martin Pugh http://apod.nasa.gov/apod/ap130529.html 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. http://www.martinpughastrophotography.id.au/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130529 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0529

APOD: The Milky Trail (2013 Jun 01) Image Credit & Copyright: Wally Pacholka (AstroPics.com, TWAN) http://apod.nasa.gov/apod/ap130601.html Explanation: Have you ever hiked the Queen's Garden trail in Bryce Canyon, Utah, USA, planet Earth? Walking along that path in this dark night skyscape, you can almost imagine your journey continues along the pale, luminous Milky Way. Of course, the name for our galaxy, the Milky Way (in Latin, Via Lactea), does refer to its appearance as a milky band or path in the sky. In fact, the word galaxy itself derives from the Greek for milk. Visible on moonless nights from dark sky areas, though not so bright or quite so colorful as in this image, the glowing celestial band is due to the collective light of myriad stars along the plane of our galaxy, too faint to be distinguished individually. The diffuse starlight is cut by dark swaths of obscuring galactic dust clouds. Four hundred years ago, Galileo turned his telescope on the Milky Way and announced it to be "... a congeries of innumerable stars ..." http://twanight.org/pacholka http://astropics.com/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130601 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0601

APOD: Star Forming Region NGC 3582 (2013 Jun 11) Image Credit & Copyright: Desert Hollow Observatory http://apod.nasa.gov/apod/ap130611.html Explanation: What's happening in the NGC 3582 nebula? Bright stars and interesting molecules are forming. The complex nebula resides in the star forming region called RCW 57. Visible in this image are dense knots of dark interstellar dust, bright stars that have formed in the past few million years, fields of glowing hydrogen gas ionized by these stars, and great loops of gas expelled by dying stars. A detailed study of NGC 3582, also known as NGC 3584 and NGC 3576, uncovered at least 33 massive stars in the end stages of formation, and the clear presence of the complex carbon molecules known as polycyclic aromatic hydrocarbons (PAHs). PAHs are thought to be created in the cooling gas of star forming regions, and their development in the Sun's formation nebula five billion years ago may have been an important step in the development of life on Earth. The above image was taken at the Desert Hollow Observatory north of Phoenix, Arizona, USA. http://www.deserthollowobservatory.com/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130611 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0611

APOD: Sharpless 115 (2013 Jun 14) Image Credit & Copyright: Bill Snyder (at Sierra Remote Observatories) http://apod.nasa.gov/apod/ap130614.html Explanation: Sharpless 115 stands just north and west of Deneb, the alpha star of Cygnus the Swan in planet Earth's skies. Noted in the 1959 catalog by astronomer Stewart Sharpless (as Sh2-115) the faint but lovely emission nebula lies along the edge of one of the outer Milky Way's giant molecular clouds, about 7,500 light-years away. Shining with the light of ionized atoms of hydrogen, sulfur, and oxygen in this Hubble palette color composite image, the nebular glow is powered by hot stars in star cluster Berkeley 90. The cluster stars are likely only 100 million years old or so and are still embedded in Sharpless 115. But the stars' strong winds and radiation have cleared away much of their dusty, natal cloud. At the emission nebula's estimated distance, this cosmic close-up spans just under 100 light-years. http://billsnyderastrophotography.com/ http://www.sierra-remote.com/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130614 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0614

APOD: Delphinid Meteor Mystery (2013 Jun 15) Image Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution) http://apod.nasa.gov/apod/ap130615.html Explanation: Over a five hour period last Tuesday morning, exposures captured this tantalizing view of meteor streaks and the Milky Way in dark skies above Las Campanas Observatory in Chile. During that time, astronomers had hoped to see an outburst from the gamma Delphinid meteor shower as Earth swept through the dust trail left by an unknown comet. Named for the shower's radiant point in the constellation Delphinus, a brief but strong outburst was reported in bright, moonlit skies on June 10, 1930. While no strong Delphinid meteor activity was reported since, an outburst was tentatively predicted to occur again in 2013. But even though Tuesday's skies were dark, the overall rate of meteors in this field is low, and only the three lower meteor streaks seem to point back to the shower's estimated radiant. http://www.lco.cl/ http://carnegiescience.edu/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130615 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0615

How to give a 1,500-pound manatee a heart exam

<b>U. FLORIDA (US) —</b> Scientists are testing endangered manatees in captivity and in the wild for heart problems using a table built to hold the heavy …


In this week’s NME – “Wembley is the peak. This is Mount Everest”. The Killers headline Wembley. But what’s next for Las Vegas’ favourite sons? Plus Black Sabbath are back and breaking records, 20 years of The Verve and we pit Kanye West’s return against Kings of Leon’s comeback show. On sale now: http://bit.ly/10tWfWW

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