A SPECTACULAR double act starring Jupiter and Venus will light up the sky tonight.

The two brightest planets will appear to be unusually close together - roughly two thirds of a full moon's width apart.

They are not about to collide, it is only an illusion caused by line-of-sight. In fact hundreds of millions of miles of space separate the planets.

After tomorrow they will start to go their separate ways again, with Venus below Jupiter.

The time to look is about 10.30pm to 11pm.