Hubble and Webb Examine the Cat’s Head Nebula’s Red ‘Eye’

Infrared reveals more. On the cat’s left, Webb exposes ghostly wisps of dust and gas, delicate structures exposed to radiation from nearby massive stars.

Webb’s mid-infrared images add a separate view with different information. The teams said each infrared image helps build a more rounded understanding of the Cat’s Head Nebula.

Takeaway: The red “eye” remains a possible young star, while Webb reveals surface detail and wisps that visible light leaves hidden.

How are massive stars reshaping the pillar?

“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,” the teams said.

Ultraviolet radiation lies beyond visible light, and stellar winds carry material away from stars. Together, these forces erode the surrounding gas and dust, an effect the teams call stellar feedback.

Denser material within the feline-shaped pillar resists that erosion, at least for now. The surrounding gas wears away while the central pillar keeps its shape.

A ridge of hazy yellow follows the filament’s right edge. The teams said the bright rim is consistent with gas illuminated and ionized by ultraviolet radiation from nearby massive stars. Ionization means radiation has altered the gas’s atoms.

That illumination may be driving photoevaporation, the erosion of gas through radiation. The teams described the rim as consistent with the process, not as proof of it. The rim may be eroding.

The diffuse material surrounding the pillar glows blue and cyan above, shifting to yellow, orange and red toward the bottom. The colors mark differences in the material around the dust structure.

Takeaway: Massive stars appear to be eroding the scene, while denser material in the pillar resists for now.

What do Hubble and Webb add together?

Each telescope sees the same cat-shaped structure in a different range of light. Their combined images separate the dark outline from the more detailed view of material behind and around it.

• Hubble, visible light: An opaque, dark brown dust pillar dominates the frame. Its red “eye” is a candidate for a young star still partly embedded in dust.
• Webb, near-infrared: The filament becomes transparent, its complex surface becomes visible, and ghostly wisps appear on the cat’s left.
• Webb, mid-infrared: A separate infrared view contributes different information, helping the teams build a fuller picture of the nebula.

The bright yellow rim along the filament’s right side may mark photoevaporation, where ultraviolet radiation lights and erodes gas. Surrounding colors range from blue and cyan at the top to yellow, orange and red below.

The teams’ timeline remains open. They expect the nebula to disperse as stars form and evolve, but they set no date for that change and say the pillar’s dense material resists erosion only for now.

Takeaway: Hubble shows the silhouette; Webb shows more of what lies within and around it.