The grenade exploded, sending up a large black burst of smoke and dust.

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Cartagena, Colombia (CNN) -- Police dressed in black burst through a door, opening fire and rushing toward a man crouched in the corner.

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Having squandered one set point on the Tipsarevic serve, the set was left at 5-2 when the black clouds finally burst and play was suspended.

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As Stephen Hawking has demonstrated, black holes eventually evaporate in a burst of radiation.

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"This is the first time we see a binary black hole in action, the smoking gun for something that will become a major gravitational wave burst in the future, " says Hasinger.

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