Simple facts

What it is: Pismith 24, Young Star Cluster

Where is it: 5,500 light years away, in the constellation Scorpio

When shared: September 4, 2025

In this new heavenly dreamscape in James Webbspace Telescope (JWST), the starry sky appears to point to a milky star herd, just as it appears to point to a bright star herd above in the starry sky.

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JWST image of shining stars and cloudy rainbow star clusters

James Webb Space Telescope’s view of a young star cluster 5,500 light-years from the solar system. (Image credits: NASA, ESA, CSA, and STSCI, A. Pagan (STSCI))

It’s an independent nursery, but there’s nothing ordinary about the Pismis 24 stars. This is the most known star in the galaxy. The brightest star in the cluster, Pismis 24-1 was once considered a single star with a solar mass of 200 to 300. This is almost twice the upper limit of the commonly accepted upper limit of the star.

However, in 2006, Hubble Space Telescope discovered that the Pismis 24-1 actually had at least two separate stars orbiting each other. With solar masses of 74 and 66 respectively, the two stars are one of the largest and brightest stars in the Milky Way. Their intense UV rays and starry winds created dusty dream scenery captured infrared by JWST’s near-infrared cameras.

Like all images in JWST, there is a color code to understand before you fully understand what you are seeing. Astronomers assign different color filters to light of different wavelengths. Cyan is a hydrogen gas ionized at high temperatures. The orange is dust. Deep red is cooler and more dense hydrogen. And the white is a starlight scattered in dust. The dark, black area shows gases and dust so thick that even the infrared sensors on JWST can’t penetrate it.

For sublime space images, see Space Photos in this week’s archives.


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