Aug 28, 2025
#4247 ＠ 埼玉県さいたま市中央区本町西（大むら）
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#4247 ＠ 埼玉県さいたま市中央区本町西（大むら）
One galaxy, three supernovae
In astronomy, the devil is in the details — as this image, taken by the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys and Wide-Field Camera 3, demonstrates.
The numerous fuzzy blobs and glowing shapes scattered across this image make up a galaxy cluster named RXC J0949.8+1707. Located to the upper right of the frame sits an especially beautiful and interesting barred spiral galaxy, seen face-on. In the past decade, astronomers peering at this galaxy have possibly discovered not one but three examples of a cosmic phenomenon known as a supernova, the magnificently bright explosion of a star nearing the end of its life.
The newest supernova candidate is nicknamed SN Antikythera, and can be seen to the lower right of the host galaxy. This shone brightly in visible and infrared light over a number of years before fading slightly. The two other supernovae, nicknamed SN Eleanor and SN Alexander, were present in data collected in 2011 but are not visible in this image, which was taken a few years later — their temporary nature unambiguously confirmed their status as supernovae. If future observations of RXC J0949.8+1707 show SN Antikythera to have disappeared then we can most likely label it a supernova, as with its two older (and now absent from the images) siblings.
This image was taken as part of an observing programme called RELICS (Reionization Lensing Cluster Survey). RELICS imaged 41 massive galaxy clusters with the aim of finding the brightest distant galaxies for the forthcoming NASA/ESA/CSA James Webb Space Telescope (JWST) to study.
https://www.spacetelescope.org/images/potw
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#4247
Swerve Strickland
Megan Bayne
4247 Chicago, IL 08/17/2025
Melissa & Doug Sticker Collection Book; Arts & Crafts; Princesses, Tea Party, Animals, & More 500+ Stickers
Day Four Thousand Two Hundred Forty-Seven 4247日目
Cloudy, 14.0 C Measured the length and poured water. Probably 1.1 cm long.
曇り 14.0℃ 長さをはかり、水をやる。おそらく全長1.1cm。
