Behzad

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This Incredible 1.5-Billion-Pixel Image Is the Biggest Hubble Picture Ever

See 100 million stars in our neighboring galaxy, Andromeda.<p><i>(Photo Credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (University of Washington), the PHAT team, and R. Gendler)</i><p>NASA has just released the biggest picture ever. Seriously. It would take more than 600 HD screens to display …

NASA Wants To Send A Nuclear Submarine To Saturn's Moon Titan

Nothing says "we come in peace" like a military spaceplane delivering a nuclear sub<p>There are places beyond the reach of NASA’s current army of robot space explorers. Impressive and capable as Curiosity and other land rovers are, they’d be pretty useless in the liquid hydrocarbon lakes of Saturn’s …

Moon

Nasa finds evidence of a vast ancient ocean on Mars

A huge primitive ocean covered one-fifth of the red planet’s surface, making it warm, wet and ideal for alien life to gain a foothold, scientists say<p>A massive ancient ocean once covered nearly half of the northern hemisphere of Mars making the planet a more promising place for alien life to have …

Earth Science

APOD: The Hercules Cluster of Galaxies (2014 Jun 25) Image Credit & Copyright: Ken Crawford http://apod.nasa.gov/apod/ap140625.html Explanation: These are galaxies of the Hercules Cluster, an archipelago of island universes a mere 500 million light-years away. Also known as Abell 2151, this cluster is loaded with gas and dust rich, star-forming spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. The colors in this remarkably deep composite image clearly show the star forming galaxies with a blue tint and galaxies with older stellar populations with a yellowish cast. The sharp picture spans about 3/4 degree across the cluster center, corresponding to over 6 million light-years at the cluster's estimated distance. Diffraction spikes around brighter foreground stars in our own Milky Way galaxy are produced by the imaging telescope's mirror support vanes. In the cosmic vista many galaxies seem to be colliding or merging while others seem distorted - clear evidence that cluster galaxies commonly interact. In fact, the Hercules Cluster itself may be seen as the result of ongoing mergers of smaller galaxy clusters and is thought to be similar to young galaxy clusters in the much more distant, early Universe. http://www.imagingdeepsky.com/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140625 #APOD

APOD: Noctilucent Clouds over London (2014 Jul 10) Image Credit & Copyright: Christoph Malin (TWAN) http://apod.nasa.gov/apod/ap140710.html Explanation: This scene from the early morning hours of July 4 looks out across the River Thames from the Westminster Bridge. Part of a luminous timelapse video (vimeo), the frame captures a sight familiar in London, the nighttime glow of the London Eye. But a not-so-familiar sight is shining in the still dark sky above, widespread noctilucent clouds. From the edge of space, about 80 kilometers above Earth's surface, the icy clouds can still reflect sunlight even though the Sun itself is below the horizon as seen from the ground. Usually spotted at high latitudes in summer months the diaphanous apparitions are also known as polar mesospheric clouds. The seasonal clouds are understood to form as water vapor driven into the cold upper atmosphere condenses on the fine dust particles supplied by disintegrating meteors or volcanic ash. NASA's AIM mission provides daily projections of the noctilucent clouds as seen from space. http://christophmalin.com/ http://twanight.org/cmalin Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140710 #APOD

APOD: A Solar Filament Erupts (2014 Jul 20) Image Credit: NASA's GSFC, SDO AIA Team http://apod.nasa.gov/apod/ap140720.html Explanation: What's happened to our Sun? Nothing very unusual -- it just threw a filament. Toward the middle of 2012, a long standing solar filament suddenly erupted into space producing an energetic Coronal Mass Ejection (CME). The filament had been held up for days by the Sun's ever changing magnetic field and the timing of the eruption was unexpected. Watched closely by the Sun-orbiting Solar Dynamics Observatory, the resulting explosion shot electrons and ions into the Solar System, some of which arrived at Earth three days later and impacted Earth's magnetosphere, causing visible aurorae. Loops of plasma surrounding an active region can be seen above the erupting filament in the ultraviolet image. Over the past week the number of sunspots visible on the Sun unexpectedly dropped to zero, causing speculation that the Sun has now passed a very unusual solar maximum, the time in the Sun's 11-year cycle when it is most active. http://www.nasa.gov/ http://www.nasa.gov/centers/goddard/ http://sdo.gsfc.nasa.gov/ Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=140720 #APOD