Subscribe:
RSS feed
"Everything should be as simple as it is, but not simpler", Albert Einstein
Browsing All Posts published on »January 19th, 2012«
Video: A Long Duration Solar Flare
The Solar Dynamics Observatory (SDO) captured this video of the M3.2 solar flare on January 19, 2012. The graph at the top indicates corresponding X-ray measurements taken by the GOES-15 satellite. Credit: NASA/SDO/GOES-15 http://youtu.be/ChHv-4IaQN0 A long duration M-class flare began erupting on the sun at 8:42 AM ET on Thursday, January 19. The flare is […]
What triggers star formation in galaxies?
January 19, 2012
Bruce G. Elmegreen Processes that promote the formation of dense cold clouds in the interstellar media of galaxies are reviewed. Those that involve background stellar mass include two-fluid instabilities, spiral density wave shocking, and bar accretion. Young stellar pressures trigger gas accumulation on the periphery of cleared cavities, which often take the form of rings […]
January 19, 2012
1