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Echoes of the Big Bang

Gravity waves from the ancient universe reveal its expansion

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MAGAZINE HIGHLIGHTS

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Supernova's Shocking Second Act

Scientists have discovered what fuels the high-energy X-rays bursting from Tycho's supernova.
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The Un-Constellations

Some of the most well-known star patterns in the sky aren't constellations, they're asterisms.
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Rumblings From the Massive Black Hole at the Center of our Galaxy

A slumbering monster known as Sagittarius A* sits quietly at the center of our galaxy — for now.
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