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Astronomers glimpse cosmic dawn, when the stars switched on

WASHINGTON — After the Big Bang, it was cold and black. And then there was light. Now, for the first time, astronomers have glimpsed that dawn of the universe 13.6 billion years ago when the earliest stars were turning on the light in the cosmic darkness.

And if that’s not enough, they may have detected mysterious dark matter at work, too.

Satellites see big fishing’s footprint on the high seas

WASHINGTON — Scientists tag sharks to see where they roam in the high seas, but until now they couldn’t track the seas’ biggest eater: Humans.

By using ships’ own emergency beacons, researchers got the first comprehensive snapshot of industrial fishing’s impacts around the globe. And it’s huge ‚Äî bigger than scientists thought, according to a new study.

European space probe prepares to sniff Martian atmosphere

BERLIN — A European space probe has swung into position around Mars in preparation to analyze its atmosphere for possible signs of life.

The European Space Agency said Wednesday its Trace Gas Orbiter successfully performed a delicate manoeuvr known as aerobraking that involved dipping into the red planet’s upper atmosphere to slow the probe.