Marrec Selous

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APOD: A Year on the Sun (2013 Apr 26) Image Credit: NASA, Solar Dynamics Observatory http://apod.nasa.gov/apod/ap130426.html Explanation: Our solar system's miasma of incandescent plasma, the Sun may look a little scary here. The picture is a composite of 25 images recorded in extreme ultraviolet light by the orbiting Solar Dynamics Observatory between April 16, 2012 and April 15, 2013. The particular wavelength of light, 171 angstroms, shows emission from highly ionized iron atoms in the solar corona at a characteristic temperatures of about 600,000 kelvins (about 1 million degrees F). Girdling both sides of the equator during the approach to maximum in its 11-year solar cycle, the solar active regions are laced with bright loops and arcs along magnetic field lines. Of course, a more familiar visible light view would show the bright active regions as groups of dark sunspots. Three years of Solar Dynamics Observatory images are compressed into this short video. http://www.nasa.gov/mission_pages/sdo/news/first-light-3rd.html http://www.youtube.com/watch?v=dHvPJp9YFfY Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130426 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0426

WIRED Space Photo of the Day 2013

PhysicsWhy Do You Feel Lighter at the Top of a Ferris Wheel?<p>Author: Rhett AllainRhett Allain<p>EcologyHow Plastic Straws Slip Through the Cracks of …

APOD: Sharp Stereo (2013 Apr 27) Image Credit: NASA, JPL-Caltech, MSL http://apod.nasa.gov/apod/ap130427.html Explanation: Get out your red/blue glasses and gaze across the floor of Gale crater on Mars. From your vantage point on the deck of the Curiosity Rover Mount Sharp, the crater's 5 kilometer high central mountain looms over the southern horizon. Poised in the foreground is the rover's robotic arm with tool turret extended toward the flat veined patch of martian surface dubbed "John Klein". A complete version of the stereo view spans 360 degrees, digitally stitched together from the rover's left and right navigation camera frames taken in late January. The layered lower slopes of Mount Sharp, formally known as Aeolis Mons, are a future destination for Curiosity. http://photojournal.jpl.nasa.gov/catalog/PIA16925 Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130427 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0427

APOD: A Raging Storm System on Saturn (2013 Apr 28) Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA http://apod.nasa.gov/apod/ap130428.html Explanation: It was one of the largest and longest lived storms ever recorded in our Solar System. First seen in late 2010, the above cloud formation in the northern hemisphere of Saturn started larger than the Earth and soon spread completely around the planet. The storm was tracked not only from Earth but from up close by the robotic Cassini spacecraft currently orbiting Saturn. Pictured above in false colored infrared in February, orange colors indicate clouds deep in the atmosphere, while light colors highlight clouds higher up. The rings of Saturn are seen nearly edge-on as the thin blue horizontal line. The warped dark bands are the shadows of the rings cast onto the cloud tops by the Sun to the upper left. A source of radio noise from lightning, the intense storm was thought to relate to seasonal changes when spring emerges in the north of Saturn. After raging for over six months, the iconic storm circled the entire planet and then tried to absorb its own tail -- which surprisingly caused it to fade away. http://www.ciclops.org/view_event/165/ http://www.jpl.nasa.gov/news/news.php?release=2011-359 http://saturn.jpl.nasa.gov/news/cassinifeatures/feature20111117/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=130428 Starship Asterisk* • On This Day in APOD http://asterisk.apod.com/view_retro.php?date=0428

Milky Way over Crater Lake

Crater Lake in Oregon is famous for the clarity and blue color of its water. But it’s also a beautiful place to go stargazing.<p>Ben Coffman Photography …