Astronomers see 'warm' glow of Uranus's rings

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Two telescopes have measured the faint heat from the main, or epsilon ring, of Uranus, enabling astronomers for the first time to determine its temperature: a cool 77 Kelvin. Earlier images of the rings came from reflected light only. The observations also show that the rings lack dust, which is common in the rings of other planets, and are composed of centimeter-sized particles and larger.
via Science Daily
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Northern lights' 'social networking' reveals true scale of magnetic storms

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Magnetic disturbances caused by phenomena like the northern lights can be tracked by a 'social network' of ground-based instruments, according to a new study.
via Science Daily
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