VY Canis Majoris is some 4,500 light-years from Earth and it could be seen to explode as a supernova at any time.

It is colossal. If VY Canis Majoris were sited at the centre of our Solar System, its surface would extend to the orbit of Saturn.

The star, in the constellation Canis Major, has been recorded by astronomers for at least 200 years.

It is what is called a red hypergiant - a highly evolved object that is exhausting its nuclear fuel.

Its end days see it spew vast quantities of gas and dust into interstellar space, including elements such as carbon, oxygen and nitrogen - the raw materials that will go into the production of future planets, and, who knows, perhaps life elsewhere in the galaxy.