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NASA’s Astronomy Picture of the Day for Nov. 9, 2026, features the Witch Head Nebula, IC 2118, near the bright star Rigel. The NASA explanation says the nebula spans about 50 light-years and that its blue appearance comes from Rigel’s light and the way dust scatters blue wavelengths.
NASA’s Astronomy Picture of the Day for Nov. 9, 2026, features IC 2118, the Witch Head Nebula, with the bright star Rigel positioned just below the center of the image. NASA’s accompanying explanation describes the nebula as about 50 light-years across and says Rigel’s blue starlight helps illuminate it, while dust grains scatter blue light more efficiently than red.
The NASA Science entry presents the image as part of the daily APOD service, which pairs an image or photograph of the cosmos with a brief explanation written by a professional astronomer. The entry is dated November 9, 2026, and credits the image to Piotr Czerski. Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti and Keighley Rockcliffe are listed as authors and editors.
IC 2118 is popularly called the Witch Head Nebula because its outline has been said to resemble a stylized witch’s head. NASA’s text treats that resemblance as a matter of interpretation: exactly how someone sees the shape can invite imaginative speculation. The explanation gives a physical account of the nebula’s appearance, rather than treating the nickname as a scientific description.
NASA says the nebula’s gas and dust point toward Rigel and have been partly eroded by the nearby star. Rigel is identified in the entry as one of the brighter stars in the constellation Orion. Its intense blue light illuminates the material, while the dust’s scattering properties contribute to the nebula’s blue color. The NASA page compares this scattering effect with the reason Earth’s daytime sky appears blue, while noting that Earth’s atmosphere scatters light through nitrogen and oxygen molecules.
How Rigel Shapes the Nebula
The image and its explanation connect a striking astronomical object to the physical processes that make it visible. The Witch Head Nebula’s blue appearance is not simply a label or an effect of image composition in NASA’s account: it is linked to Rigel’s illumination and to the way dust scatters different wavelengths of light. The explanation also describes the star as having partly eroded the gas and dust, indicating that nearby stars can affect the material around them.
For readers, the comparison with the blue daytime sky offers a familiar way to understand the image. The underlying process is scattering in both cases, although the particles involved differ: dust grains in the nebula and nitrogen and oxygen molecules in Earth’s atmosphere. APOD’s format makes that connection accessible alongside an astronomical image, without requiring the reader to treat the witch-like outline as anything more than a popular visual interpretation.
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APOD’s Daily Cosmic Image
NASA describes Astronomy Picture of the Day as a service that features a different image or photograph of the universe each day, accompanied by an explanation written by a professional astronomer. The Nov. 9 entry follows that format: it identifies the object, gives a scale estimate, explains the role of a nearby star and outlines why the nebula appears blue. The page also lists the image credit and its authors and editors.
The entry names the nebula as IC 2118 and locates Rigel just below the center of the featured image. It describes Rigel as one of Orion’s brighter stars. NASA’s explanation links the star and nebula through both illumination and erosion, offering a concise account of why they appear together in this view. The page also points readers to the following day’s APOD, identified as “Suddenly Saturn.”
What the Image Cannot Establish
NASA’s entry does not provide a measurement method or further technical detail for the estimate that IC 2118 is about 50 light-years across. It also does not quantify how much of the nebula’s appearance is attributable to Rigel’s illumination versus scattering by dust. The explanation describes both as contributing factors but does not assign proportions.
The witch-head resemblance is explicitly presented as a popular interpretation, not an objective feature with a single agreed reading. The source does not provide additional details about the nebula’s composition, age, distance from Earth or the rate of erosion. Those points cannot be established from this APOD entry alone.
The Next Daily APOD
The next item listed by NASA is an APOD titled “Suddenly Saturn.” The Nov. 9 page does not give further information about that image or its explanation. Readers can expect the service’s next daily entry to supply its own image and accompanying astronomy notes; any additional details about Saturn will depend on that publication.
Key Questions
What is the Witch Head Nebula?
IC 2118 is a nebula of gas and dust popularly known as the Witch Head Nebula because its shape has been said to resemble a witch’s head. NASA’s Nov. 9, 2026, APOD describes it as about 50 light-years across.
Why does the nebula look blue?
NASA says its blue appearance comes from Rigel’s intense blue starlight and from dust grains scattering blue light more efficiently than red light.
What role does Rigel play?
Rigel illuminates the nebula, and NASA’s explanation says the star has also partly eroded its gas and dust. The entry places Rigel just below the center of the featured image and identifies it as one of Orion’s brighter stars.
Who made the featured image?
The NASA page credits the image to Piotr Czerski. It lists Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti and Keighley Rockcliffe as authors and editors.
Source: science.nasa.gov
