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We have at least once wondered about the end of the world. But today our ideas about it have been shaped largely by cinema and literary fiction.

In her book "The Ultimate End," Katey Mack, an American astrophysicist, discusses five possible end-of-the-world scenarios - not just for our planet, but for the entire world - from a scientific perspective.

We know that the universe had a beginning. After the Great Boom, it went from the state of superpower to the all-encompassing ball of space from the baked plasma in the form of cules - the first stars and planets. On one of such planets, life was born due to a marvellous collision of circumstances...

But there was no life.

But where there is a beginning, there must be an end. Mac confirms: it can come any day, any day. What does that mean for us, and do we have the sense to make plans for the next weekend, when everything can just as easily come to an end in an instant?