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A speedy stream of solar particles is washing past Earth this week, sparking off amazing displays of the Northern Lights in our night skies. Here's the best times and places to watch!

Elon Musk lets us in on his plans for putting humans on Mars

Scientists are using social media to determine air quality

Mercury morning star worth getting up for, see where to look

New video shows Montreal meteor flash through the night sky

By 2100 all of Earth's wilderness is expected to disappear

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