It's 66 million years before today - the last days of the Mesozoic era. An asteroid slams into the planet with enormous force. The impact leaves a crater that's more than 100 miles across. The crash sets off a series of natural disasters that erase 80% of life on Earth. It’s the very asteroid that’s going to finish off dinosaurs. All the creatures close enough to see the crash, don't survive for longer than a few seconds - so powerful the hit is.

More than 30,000 objects that are circling Earth these days can potentially strike our planet. NASA considers around 1,500 of them "potentially hazardous." These space rocks are the remains left after the Solar System was formed some 4.6 billion years ago. If one of these objects hits our planet, the consequences will be unpredictable. They can vary from shattered glass and broken windows to all life forms getting wiped off the face of the earth. Unfortunately, in our case, it's likely to be the second option. In 2004, astronomers discovered a huge asteroid nearing Earth...

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