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Study finds no magnetic field on Rosetta's comet - why that matters
Study finds no magnetic field on Rosetta's comet - why that matters

The first scientific paper to include observations from the surface of a speeding comet has been released, marking a new era in cometary science. The paper, published Tuesday in the journal Science, uses data from the European Space Agency's Philae lander and the Rosetta orbiter to determine whether the nucleus of comet 67P/Churyumov-Gerasimenko has its own magnetic field. Other space missions have tried to measure the magnetic field of comet nuclei in the past, but the results were never conclusive. To be fair, it is a difficult observation to make. As comets fly toward the sun they begin to heat up, causing formerly frozen gas and dust to spew from vents on the...

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