In a universe where processes are often measured in millions and billions of years, the Hubble Space Telescope witnessed something extraordinary over the course of just two decades. The Stringray nebula went from bright in 1996 to faded in 2016, as if it had been left hanging on a cosmic drying line.
Stingray, more formally known as Hen 3-1357, was hailed as the youngest known planetary nebula when it was first noticed. The nebula formed during the star’s end of life when it ejected glowing gases that gave it a marine-animal-like shape.
What’s so wild about the