Astronomy Picture of the Day ·
NGC 6357: Cathedral to Massive Stars
The Astronomy Picture of the Day for September 23, 2025 is “NGC 6357: Cathedral to Massive Stars,” an image. It is credited to Image Credit: NASA , ESA , CSA , STScI , JWST ; Processing: Alyssa Pagan ( STScI ); Rollover: NASA , ESA , HST , & J. M. Apellániz ( IAA , Spain); Acknowledgement: D. De Martin ( ESA/Hubble ). The original explanation runs about 184 words.
From the explanation
“How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun , making it one of the most massive stars known.”
— APOD editors, September 23, 2025
Read the full explanation on science.nasa.gov
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At a glance
- Date
- September 23, 2025
- Type
- Image
- Credit
- Credit: Image Credit: NASA , ESA , CSA , STScI , JWST ; Processing: Alyssa Pagan ( STScI ); Rollover: NASA , ESA , HST , & J. M. Apellániz ( IAA , Spain); Acknowledgement: D. De Martin ( ESA/Hubble )
- Copyright
- No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
- Explanation length
- About 184 words