There are a lot of things in Earth's night sky, and every now and again, they line up in such a way to give us all a little bit of a giggle. On the nights of Thursday 24 and Friday 25 April, just such an alignment is going to take place,

The Moon, Venus, and Saturn are expected to briefly align into a rare formation resembling a "smiley face" this week, Nasa has said. Skygazers will be able to see the two planets and the crescent Moon align into a grin that could last about an hour in the early hours of Friday,