Friday, 25 May, 2012

New pix from Mars show sand dunes on the move. Mars has been dry for 1.5 billion years; could massive erosion be due to wind? Yes, says a new report that tracked dunes with precise new images. Surprise: dunes move as fast on Mars as on Earth!

Volcanic eruptions are unpredictable, but here’s a new view of the historic eruption of a Mediterranean monster. About 3,500 years ago, Santorini’s eruption left a giant caldera and 60-meter layers of pumice. A new study of tiny crystals tracks the movement of molten magma before the cataclysm.

The ocean’s most valuable fish are caught in a vise. Areas known as dead zones are encroaching on their living zones and pinning them closer to the surface, where they are more vulnerable to becoming the day’s catch. The predicament is yet another side effect of climate change.

If scientists agree that the globe is warming, aren’t hot, dry spells more evidence of warming? Yes, but. Last year’s Texas heat wave showed a blend of climate change and natural variation. More on the search for the fingerprints of global warming.

Seismic study shows crust thinning as continent divides, giving another view of our restless planet, showing tectonic movement in action, and highlighting a major real-estate investment opportunity.

With space shuttles in museums, what is the near-term American plan to return to space? Can other countries or private companies fill the gap?

If conflicts are more common near the equator, what will global warming affect do? A new study shows increases in conflict during el Niño periods — but only during the warm, dry part of the cycle, and only in places affected by these big climatic cycles.

New instruments are giving a better view of how those astonishingly strong lightning bolts form inside clouds – and we are also getting a better picture of the many ways that lightning can harm us.

A new report on the ancient universe shows that most galaxies – even all of them – had a black hole at the center, much like modern galaxies. We can understand why a black hole would need to be surrounded by millions of stars, but why should galaxies require black holes?

Tornadoes need wet air, dry air, and wind shear. What explains the big improvement in tornado prediction? Is climate change boosting these storms?