A pair of missions to two asteroids near Earth are beginning to provide new information about when, where and in what form water first existed in the solar system.
Why it matters: Water played a key role in the formation of planets — and the emergence of life that evolved on at least one world thereafter.
A major new study explains why Western Europe has suffered through a series of extreme heat waves that are outpacing even the planet's overall warming trend.
Driving the news: The study points to stubborn changes in atmospheric circulation for much of the blame.
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