Zobrazujú sa príspevky s označením astronomy. Zobraziť všetky príspevky
Zobrazujú sa príspevky s označením astronomy. Zobraziť všetky príspevky

nedeľa 2. mája 2010

The human brain is not that special

Biology:
"A British-led study has found striking similarities among the human brain, the nervous system of the nematode worm Caenorhabditis elegans and computer chips. A team of U.K., U.S. and German neuroscientists and computer experts led by University of Cambridge Professor Edward Bullmore compared the way the systems are organized and found all three have the same networking principles. The researchers said they found all three share two basic properties: All have the same architecture, with the same patterns repeating at different scales; and all show what's known as Rentian scaling -- a rule used to describe the relationship between the number of elements in a given area and the number of links between them."

"Study: The human brain may not be special." Space Daily
The human brain may not be special

Astronomy:
"Josh Emery, research assistant professor with the earth and planetary sciences department at the University of Tennessee, Knoxville, has found evidence of water ice and organic material on the asteroid 24 Themis. This evidence supports the idea that asteroids could be responsible for bringing water and organic material to Earth."


"Scientists find evidence of water ice on asteroid's surface." Space Daily
Water ice on asteroid

Energy:
"Two trends are emerging for future renewable electricity. In the first, local solar, wind or biomass plants will produce more energy for small communities or single homes. In the second, large amounts of electricity will be generated by solar power stations in desert areas or extensive offshore wind farms, and delivered over long distances to densely populated areas. But how can electrical power be delivered over long distances without large losses? The solution to this problem is direct current. When electrical power at voltages from 100,000 to 1,000,000 volts is routed through high-voltage direct current (HVDC) transmission cables, energy losses are significantly reduced."

"How is electrical power carried across the sea." Space Daily
Electrical power transmission across the sea

sobota 24. apríla 2010

Sun - Solar Flare

Astronomy:
"Soon after the instruments opened their doors, the Sun began performing for SDO with this beautiful prominence eruption. This AIA data is from March 30, 2010, showing a wavelength band that is centered around 304 �. This extreme ultraviolet emission line is from singly ionized Helium, or He II, and corresponds to a temperature of approx. 50,000 degrees Celsius."


streda 10. júna 2009

Massive Black Hole

Astronomy:
"A pair of pioneering astronomers revealed Tuesday how they used a supercomputer to show that a nearby black hole is vastly more massive than scientists ever imagined.
The black hole at the heart of the relatively close Messier 87 Galaxy (M87) weighs in at 6.4 billion times the mass of our Sun, according to US astrophysicist Karl Gebhardt and Germany's Jens Thomas, who say it's the largest ever measured with a reliable technique.
One of the more enigmatic features of astronomy, a black hole is a region in space that is inferred by tracking stars that orbit it. Objects fall into its stupendous gravitational field but nothing, not even light, can return.
Gebhardt and Thomas' revelation, they say, sheds light on how galaxies grow, and may solve the paradox of quasars -- active black holes guzzling matter in distant galaxies that scientists are struggling to understand."

"Black Hole more massive than imagined." Space Daily
Massive Black Hole

Energy:
Nuclear fusion is an interesting thing. The sun and the stars work through nuclear fusion. In this process, several lighter nuclei fuse together and form one larger nucleus. Energy is then released.
"A multi-billion-dollar project to prove whether nuclear fusion, the power that fuels the Sun, can be a practicable energy source is to be scaled down in its early stages, sources said on Monday.
The test reactor, to be built at a site in southern France, will start its experiments in 2018 as scheduled but will initially be built in a slimmed-down form, they said."

"Nuclear fusion power project to start in slimmed-down version." Space Daily
Nuclear Fusion
 
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