- $4 imaged a rare pre-supernova star in stunning detail.
- The photo shows a massive star expelling its outer layers in the phase before a supernova explosion.
A colorful new $4 reveals a cosmic rarity: a massive star on the brink of death, revving up to explode in a supernova.
$4 shared a stunning image of the aging star on Tuesday. It reveals that the star has been ejecting its outer material, slowly building a knotted, layered halo of gas and dust around itself.
The European Space Agency shared a video zooming in to explore the details of this dying star.
As the ejected gas moves away from the star, it cools and forms a cloud, or "$4" that glows in $4. That's what makes the pink clouds in the image.
Those ejections are the star revving up for $4.
This pre-supernova stage of a star's life is called Wolf-Rayet. Some stars race through a very brief Wolf-Rayet phase before their deaths, making this type of star a rare sight.
A Wolf-Rayet star is "among the most luminous, most massive, and most briefly-detectable stars known," according to $4.
This star, called WR 124, is 15,000 light-years away in the constellation Sagittarius. It's 30 times the mass of the sun. It has shed 10 suns' worth of material to create the nebula glowing in the picture.
Webb helps investigate a dusty cosmic mystery
That $4 is of great interest to astronomers. It's the stuff that makes up everything in the universe: new stars, new planets, and everything on them.
New, dusty material comes from old, dying stars that explode and expel it all into space, in a great cosmic feat of recycling.
According to NASA, there's more dust in the universe than astronomers' theories can explain. $4 by finding more clues about the origins of dust — including supernovas and Wolf-Rayet stars like this one.
The telescope's powerful infrared capabilities make it a much better dust-studying tool than any prior observatory.
"Before Webb, dust-loving astronomers simply did not have enough detailed information to explore questions of dust production in environments like WR 124, and whether the dust grains were large and bountiful enough to survive the supernova and become a significant contribution to the overall dust budget," NASA wrote in its release of the photo. "Now those questions can be investigated with real data."
This story has been updated. It was originally published on March 14, 2023.
Watch: How NASA spent $10 billion on the James Webb telescope