Τετάρτη 28 Νοεμβρίου 2012

ScienceDaily: Top Science News

ScienceDaily: Top Science News


Do missing Jupiters mean massive comet belts?

Posted: 27 Nov 2012 08:12 AM PST

Astronomers have discovered vast comet belts surrounding two nearby planetary systems known to host only Earth-to-Neptune-mass worlds. The comet reservoirs could have delivered life-giving oceans to the innermost planets.

Thawing of permafrost expected to cause significant additional global warming, not yet accounted for in climate predictions

Posted: 27 Nov 2012 06:42 AM PST

Permafrost covering almost a quarter of the northern hemisphere contains 1,700 gigatonnes of carbon, twice that currently in the atmosphere, and could significantly amplify global warming should thawing accelerate as expected, according to a new report. Warming permafrost can also radically change ecosystems and cause costly infrastructural damage due to increasingly unstable ground, the report says.

First evidence of ocean acidification affecting live marine creatures in the Southern Ocean

Posted: 26 Nov 2012 08:09 AM PST

The shells of marine snails -- known as pteropods -- living in the seas around Antarctica are being dissolved by ocean acidification, according to a new study. These tiny animals are a valuable food source for fish and birds and play an important role in the oceanic carbon cycle.

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