Giant ‘diamond ring’ sparkles 4,500 light-years away in the Cygnus constellation — Space photo of the week
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What is this : A “cosmic ring” – an expanding gas bubble of ionized carbon.
Where it is: 4,500 light years away in the constellation Cygnus (the swan).
When it was shared: November 17, 2025
This striking image reveals a shimmering cosmic formation dubbed the “diamond ring”: a vast, luminous structure of gas and dust appearing as a circular loop with a bright cluster on one side.
About 20 light-years across and located in the formation region of the star Cygnus But unlike typical spherical bubbles, this one grew within a flat molecular cloud – a dense cloud of gas and dust where stars are born – before eventually breaking up and losing its symmetry. At just 400,000 years old, it is also exceptionally young, at least compared to the lifespans of massive stars.
Initially, a bright group of young stars appears to form the “diamond” in the ring, but researchers have discovered that this group is actually a separate object. It lies a few hundred light years in front of the ring and is only coincidentally aligned when viewed from Earth.
The ring shows how stars can affect much larger areas around them.
“The Diamond Ring is a great example of the enormous influence that individual stars can have on entire cloud complexes.” Nicholas Schneiderco-author of the study published this week (November 17) in the journal Astronomy and Astrophysics, said in a statement. “Such processes are crucial for understanding star formation in our Milky Way.”
The image was captured by NASA’s Stratospheric Flying Observatory for Infrared Astronomy (SOFIA), a 2.7-meter (106-inch) telescope installed in a Boeing 747SP that flew at an altitude of 45,000 feet (13,700 meters) – above 99% of Earth’s atmosphere – allowing it to capture the cosmos in infrared wavelengths invisible to observatories at ground. SOFIA made its first flight in 2010 and was canceled in September 2022 due to budget constraints. However, its vast archive of infrared observations is still being analyzed by astronomers, as was the case with this latest discovery.
Although unrelated, the term “diamond ring” in astronomy, it also refers to a dramatic event during a total solar eclipse, when a drop of sunlight shines through the valleys of the moon. The cosmic version shares this visual drama, although the mechanics are very different.
For more sublime space images, check out our Archives of space photo of the week.
