Three European spacecraft will launch from northern Russia later on a mission to make the most detailed global maps yet of Earth's magnetic field. Known as Swarm, the trio of satellites should help scientists understand better how the field is generated, and why it appears to be weakening. via Pocket http://www.bbc.co.uk/news/science-environment-25028502#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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