
The first rays of an orbital sunrise illuminate the Earth's atmosphere in this photograph from the International Space Station.

The sun rises above the Earth's horizon in this photograph from the International Space Station.

The sun rises above the horizon illuminating the Earth in this photograph from the International Space Station.

The Earth is illuminated shortly after an orbital sunrise in this photograph from the International Space Station.

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A city-sized collapsed star has generated a beam of matter and antimatter that stretches for trillions of miles.

Today is Pi Day!

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