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Earth

Dispelling Myths About Geomagnetic Reversal 158

UniverseToday has an interesting look at geomagnetic reversal, the process in which the Earth's magnetic poles trade places. The article cites known trends and recent studies to debunk doomsday myths and unsubstantiated claims about the process. One such study is attempting to model the earth's core with a 26-ton ball of molten metal. Another recently found evidence that the Earth has a second, weaker magnetic field. "We do know that this magnetic pole flip-flop has occurred many times in the last few million years; the last occurred 780,000 years ago according to ferromagnetic sediment. A few scaremongering articles have said geomagnetic reversal occurs with 'clockwork regularity' — this is simply not true."
NASA

NASA World Wind 1.4 Released With Trailer 117

Bull_UK writes "As many of you probably already know NASA had to shift it's priorities to the upcoming Java version of World Wind, leaving 1.4 effectively orphaned, but the Open Source community came together and with a lot of hard work we were able to finish what Chris Maxwell started. Some of the new things which differentiate the new World Wind from the competition are the amazing new visual effects, including HDR, check out the video for some examples. Remember this virtual globe has never had the same goals as Google Earth, if you just want to see your house stick with GE, although many areas have high resolution as good and sometimes better than GE. World Wind is aimed at education and science, all the default imagery is copyright free, you don't need to purchase a license to redistribute the imagery and there are no pro or expert versions to buy, you can happily use World Wind at work or school without fear of any lawyers confiscating your research."

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