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Talking to aliens

What do you say to a space alien? This question might not be the foremost puzzle in your life, but it was the subject of a lively two-day conference at California's SETI Institute this week.

Nov 17, 2014
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Mars, too, has macroweather

Weather, which changes day-to-day due to constant fluctuations in the atmosphere, and climate, which varies over decades, are familiar. More recently, a third regime, called "macroweather," has been used ...

Nov 13, 2014
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Galileo satellite set for new orbit

ESA's fifth Galileo navigation satellite, one of two left in the wrong orbit this summer, will make a series of manoeuvres this month as a prelude to its health being confirmed.

Nov 10, 2014
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