This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: NASA's Hubble and James Webb Space Telescopes have captured a hauntingly dynamic star-forming scene, like a spectral form rising out of a cold mist. It lies within the vast Carina Nebula, a diffuse star-forming region located about 7,500 light-years away from Earth.
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 ionized by ultraviolet radiation from nearby massive stars, potentially driving a process known as photoevaporation. 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 color variations reveal a complex mix of excited gas, dust and stellar illumination. 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.
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