Monday, June 13, 2011
Saturday, June 11, 2011
The doubts of NATO....[ 2309 ]
What should NATO bomb first, soldiers or Gadhafi himself?
June 10, 2011 4:57 p.m. EDT
Abu Dhabi (CNN) -- Night after night, day after day, NATO aircraft have hammered presidential compounds in Tripoli, Libya. I have walked over the piles of rubble.
What I and my CNN colleagues have seen, particularly in recent days, gives additional credence to reporting by CNN's counter terrorism analyst Fran Townsend that NATO's leadership believes the U.N. resolution on Libya justifies killing the country's leader Moammar Gadhafi.
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Townsend's source, a senior NATO military official with knowledge of NATO's Libyan operations, also implied more could be done to target Gadhafi.
The comments drew a rapid response from a NATO spokeswoman, hinting at an internal rift within the organization over tactics.
Friday, June 10, 2011
NASA Image of the Day Jun 10..[ 2308 ]
The latest NASA "Image of the Day" image.
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A Delta II rocket launches with the Aquarius/SAC-D spacecraft payload from Space Launch Complex 2 at Vandenberg Air Force Base, Calif. on Friday, June 10, 2011. -
The joint U.S./Argentinian Aquarius/Satélite de Aplicaciones Científicas (SAC)-D mission, set to launch June 10, will map the salinity at the ocean surface, information critical to improving our understanding of two major components of Earth's climate system: the water cycle and ocean circulation.
Photo Credit: NASA/Bill Ingalls
Παρασκευή, 10 Ιουνίου 2011 7:00:00 πμ
"Milky Way"gives birth to small stars ...[ 2307 ]
Small galaxies may only give birth to small stars
- 12:45 10 June 2011 by Ken Croswell
- For similar stories, visit the Cosmology Topic Guide
Size matters (Image: ESO/Digitised Sky Survey 2
It's as if small towns could only produce small people: dwarf galaxies may not be able to produce many large stars.
It's as if small towns could only produce small people: dwarf galaxies may not be able to produce many large stars.
Our Milky Way, a giant barred spiral galaxy, creates stars both large and small, and astronomers had assumed other galaxies did the same. But a new study of Fornax, a dwarf galaxy orbiting our own, suggests that might not be true.
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Stars of different masses create different chemical elements. Barium tends to form in stars too puny to explode, while very massive stars forge a lot of iron when they detonate.
Fornax has high levels of barium relative to iron, and Takuji Tsujimoto of the National Astronomical Observatory of Japan in Tokyo suggests this is because the galaxy never formed many stars weighing more than 25 suns.
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"It's an intriguing suggestion," says Rosemary Wyse of Johns Hopkins University in Baltimore, Maryland. "I don't think it's definitive. But it points to how useful dwarf galaxies really are in terms of trying to understand how stars form."
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So how could the size of a galaxy determine the size of the stars it gives birth to? Mark Krumholz of the University of California, Santa Cruz, and Christopher McKee of the University of California,
Berkeley, have suggested that the density of a gas cloud might affect the size of stars it can create.
Journal reference: arxiv.org/abs/1105.3218
Thursday, June 9, 2011
NASA Image of the Day Jun 9..[ 2306 ]
The latest NASA "Image of the Day" image.
Working Towards the Future
Work on the heat shield and thermal protection backshell of the Multi Purpose Crew Vehicle ground test article, or GTA, was completed in preparation for environmental testing. This image is of the crew vehicle at the Lockheed Martin Vertical Test Facility in Colorado. The crew vehicle will undergo rigorous testing to confirm its ability to safely fly astronauts through all the harsh environments of deep space exploration missions. Image Credit: NASA
Πέμπτη, 9 Ιούνιος 2011 7:00:00 πμ
Work on the heat shield and thermal protection backshell of the Multi Purpose Crew Vehicle ground test article, or GTA, was completed in preparation for environmental testing. This image is of the crew vehicle at the Lockheed Martin Vertical Test Facility in Colorado. The crew vehicle will undergo rigorous testing to confirm its ability to safely fly astronauts through all the harsh environments of deep space exploration missions. Image Credit: NASA
Πέμπτη, 9 Ιούνιος 2011 7:00:00 πμ
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