Our solar system's gas giants are about to do something that hasn't been seen for 800 years - Wales Online

The two gas giants of Jupiter and Saturn - the largest two planets in our solar system - will appear closer together in the night sky than they have in almost 800 years.

The planets can be seen at their closest just after sunset on December 21, reports the Mirror.

Patrick Hartigan, an astronomer at Rice University, said: “Alignments between these two planets are rather rare, occurring once every 20 years or so, but this conjunction is exceptionally rare because of how close the planets will appear to one another.