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Showing posts from July, 2014

TRUE FRIENDS

A story tells that two friends were walking through the desert During some point of the Journey they had an Argument, and one friend Slapped the other one In the face. The one who got slapped was hurt, but without saying anything, wrote in the sand: TODAY MY BEST FRIEND SLAPPED ME IN THE FACE . They kept on walking until they found an oasis, where they decided to take a bath. The one who had been slapped got stuck in the mire and started drowning, but the friend saved him. After he recovered from the near drowning, he wrote on a stone: TODAY MY BEST FRIEND SAVED MY LIFE. The friend who had slapped and saved his best friend asked him, "After I hurt you, you wrote in the sand and now, you write on a stone, why?" The other friend replied "When someone hurts us we should write it down in sand where winds of forgiveness can erase it away. But, when someone does something good for us, we must

the secrets of Saturn and its moons

NASA’s Cassini space probe has been one of the agency’s most successful missions ever. It has been collecting intelligence on Saturn for a decade now, giving astronomers amazing new insights while several times exceeding expectations for its overall lifespan. Perhaps more importantly, the probe has supplemented its scientific data with incredible optical photos that have captured the public imagination on more than one occasion; Cassini actually managed to squeeze some real enthusiasm from a jaded and desensitized population. Now, though, its time has finally come. In 2016, after more than 11 years spent circling the famously ringed planet, Cassini will embark on its last mission ever. Now that we have a plan for the probe’s final days, it’s worth taking a look back at its incredible, decade-long history. Cassini (actually called the Cassini-Huygens Probe) launched with a wide array of goals. NASA wanted to learn about the composition and flow of the rings, the che

What came first, black holes or galaxies?

What came first, black holes or galaxies? "For decades, this was an ideological argument primarily between Americans, who favored a bottom-up approach, and Soviets, who favored a top-down approach. Here’s the difference: Bottom-up: The Universe starts off with large-magnitude fluctuations on small scales and not on large scales. The overdense regions grow over time, producing small mass clumps that grow, merge, and cluster together, eventually growing into large galaxies and clusters of galaxies. In this scenario, black holes would form first along with small stellar clumps, and only at much later times would they grow into what we consider galaxies. Top-down: The Universe starts off with large-magnitude fluctuations on large scales and not on small scales. The overdense regions, being very large, gravitationally collapse down from irregularly-shaped triaxial ellipsoids along their shortest axis, formin