Jupiter and Venus will seem to nearly collide in rare celestial spectacle

Stargazers will have to wait years for repeat performance with four planets also appearing in straight line

Jupiter and Venus, two of the solar system's brightest planets, will appear to almost touch in a rare celestial spectacle this weekend.

Although in reality they will be millions of miles apart, for stargazers on Earth they will appear to be close enough to almost collide in a planetary conjunction that occurs once a year.