This phenomenon, known as a 'planetary parade' is a rare sight, and it will be the last time seven planets can be seen simultaneously until 2040. The best chance to see as many planets as possible will be just after sunset on Tuesday, Wednesday and Thursday.

To see the parade, find a dark place with a clear view of the western horizon at nightfall. Mercury and Saturn will be low in the sky, brushing past each other in the fading glow of the evening sun, which will make the pair difficult to spot. Trace that line of sight higher to find Venus, the most brilliant planet in the sky.

Are 7 planets having a rare alignment in our night sky? News of this unusual celestial event has been flooding social media in the last several days. But what will you really be able to see?