🐋The ESO 217-25 nebula, better known by its popular names Mermaid Nebula or Betta Fish Nebula, is an astronomical object classified as a supernova remnant.
It is located in the southern constellation of Centaurus.
It is part of the largest supernova remnant cataloged as G296.5+10.0. It is also associated with the radio source PKS 1209-51/52.
It is estimated to be located about 4,500 light-years from Earth, in the Carina Arm of the Milky Way.
It has an estimated age of 14,000 years.
This nebula is the result of the explosion of a massive star at the end of its life.
Its filamentary and sinuous structure resembles the fins of a fighting fish (betta) or the silhouette of a mermaid, depending on the orientation of the image.
Blue comes mainly from ionized oxygen (OIII) emissions.
Red represents the presence of ionized hydrogen (H-alpha).
The entire remnant covers an area twice the size of the full moon and has a physical diameter of about 100 light-years.
ESO 217-25 is an extremely faint object and difficult to observe visually with conventional telescopes, so its beauty is mainly revealed through long-exposure astrophotography using narrow-band filters.
Picture by Martin Pugh
The ESO 217-25 nebula, better known by its popular names Mermaid Nebula or Betta Fish Nebula, is an astronomical object classified as a supernova remnant.
A cat co-authored a scientific paper in 1975, when his owner, a physicist named Jack H. Hetherington, decided to add him as a second author to avoid changing the plural pronouns in his manuscript. The cat’s name was Chester, and he was given the pen name F.D.C. Willard, which stood for Felix Domesticus, Chester. Willard was also the name of Chester’s father. The paper was about atomic behavior at different temperatures, and it was published in Physical Review Letters, a prestigious physics journal.
Chester’s co-authorship was revealed when Hetherington sent some signed copies of the paper to his friends and colleagues, and included the cat’s paw prints as his signature. The story became widely known and amused many people in the scientific community. Chester even published another paper as the sole author in 1980, in a French popular science magazine. He died in 1982, but he is still remembered as the first and only cat to have authored a published scientific paper.
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