| | Cassini spacecraft image of Saturn’s moon Enceladus, with glowing jets - aka geysers - emanating from its south polar region. Image via NASA/JPL/SSI. | | |
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Meet 2018's brightest comet | | Comet 46P/Wirtanen isn't bright in any absolute sense. It requires a telescope or binoculars - and a truly dark sky - to be seen. Will it reach visibility to the eye alone? Here's what we know so far. Read more. | | |
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