29 Oct 2026------------ heic2614

The star-forming region bewitches in visible and infrared light

The NASA/ESA Hubble and the NASA/ESA/CSA James Webb Space Telescopes recently stared at an eerie star-forming scene within the Carina Nebula, a massive gas and dust cloud located approximately 7,500 light-years away from Earth. The two telescopes offer complementary views of the shadowy form, nicknamed the Cat’s Head Nebula, which reflects the “magical” process of star formation. Hubble’s visible-light view shows the cat as a dark, elongated dust pillar and hints of young forming stars, while Webb’s infrared-light imagery unveils many stars and other hidden details.

Like a spectral form rising out of a cold mist, the Hubble and James Webb Space Telescopes have captured a hauntingly dynamic star-forming scene. It lies within the vast Carina Nebula, a diffuse star-forming region. The small, select area both telescopes observed is nicknamed the Cat’s Head Nebula because of its resemblance to a cat sitting with its back toward the viewer. The “head” of the cat is turned to the right, revealing a glowing eye.

Though the Cat’s Head Nebula is a temporary scene that will eventually disperse as stars form and evolve over time, the region is packed with information. Hubble and Webb’s complementary views of the Cat’s Head Nebula are helping astronomers learn more about the elusive, chaotic, and complex process known as star formation.

The distinctive "cat's head" shape of the nebula was likely sculpted over time by the intense ultraviolet radiation and winds from massive stars in the Carina Nebula. As this stellar feedback erodes the surrounding gas and dust, denser material within the feline-shaped pillar resists erosion, at least for now.

Hubble’s visible-light view reveals an opaque, dark brown pillar of dust. The cat’s glowing red eye may indicate a young star that is still partially embedded in dust. A ridge of hazy yellow seems to follow the edge of the filament’s right side. This bright rim is consistent with gas illuminated and ionised by ultraviolet radiation from nearby massive stars, potentially driving photoevaporation.This wispy outline is a sign that energetic ultraviolet light from massive, hot stars is impinging on the gas, heating it up and essentially evaporating it.

The diffuse material surrounding the pillar glows blue and cyan above, shifting to yellow, orange, and red toward the bottom. Hubble’s filters capture light emitted by oxygen, hydrogen, and sulfur, along with starlight scattered by dust. These colour variations reveal a complex mix of excited gas, dust, and stellar illumination.

Piercing through dust’s darkness

Webb’s near- and mid-infrared images each offer different pieces of information to help create a more well-rounded understanding of the Cat’s Head Nebula. While the nebula’s overall structure is similar to the visible-light Hubble image, the filament becomes more transparent, and its complex surface structure becomes discernable in near-infrared light seen by Webb. On the cat’s left are ghostly wisps of dust and gas, delicate structures exposed to radiation from nearby massive stars.

Webb’s near-infrared view reveals a dense scattering of stars, shown in blue and yellow. Even in infrared light, some stars are still enshrouded in dust to various degrees. The cat’s eye remains conspicuous. The telescopeʼs high-resolution imagery even shows faint background galaxies, offering a partial view through our Milky Way galaxy and beyond.

In mid-infrared light, emission from warm dust and carbon-based molecules outlines intricate structures within the nebula. Changes in local conditions and compositions lead to variations in colour and brightness. Delicate globules and strands to the pillar’s left are particularly evident in this mid-infrared view.

To the right of the pillar, a bright light source is shown as yellow in the mid-infrared image. Likely an infant star embedded in dust, it lies against reddish emission from surrounding material. A narrow filament appears to cross the source, although the image alone cannot establish whether the two are physically related.

[Image]

(A) Cat’s Head Nebula (Hubble WFC3, Webb NIRCam, and Webb MIRI images)

(B) Cat’s Head Nebula (Webb MIRI)

(C) Cat’s Head Nebula (Hubble WFC3 image)

(D) Cat’s Head Nebula (Webb NIRCam image)