The five planets visible to the naked eye are lining up in the sky. Astronomers say the rare grouping of Mercury, Venus, Mars, Jupiter and Saturn may not be seen again for a century. A similar arrangement of planets happened two years ago but was not visible from Earth because of the position of the Sun. It was accompanied by scare stories that our planet could be pulled off its path or struck by extraordinary tides. The Earth, of course, survived and astronomers say this year's planetary show is no cause for concern. The five planets will begin to be visible without a telescope from 20 April.

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