The universe has a sense of humour. Nasa has just shared a stunning new look at a corner of space that resembles a giant cat’s paw, and the science behind the image is every bit as extraordinary as it looks.
Astronomers trained Nasa’s James Webb Space Telescope and the Chandra X-ray Observatory on the Cat’s Paw Nebula, also known as NGC 6334, a sprawling star-forming region approximately 5,500 light-years away in the constellation Scorpius.
Nasa marked the occasion with a playful tweet: “A-meow-zing. Webb and Chandra joined forces to deliver this view of the Cat’s Paw Nebula.”
WHAT IS THE CAT’S PAW NEBULA?
A nebula is a massive cloud of gas and dust drifting through space.
The Cat’s Paw Nebula is one of the most active stellar nurseries, or cosmic maternity wards, in our galaxy, the Milky Way.
Using its NIRCam instrument, which detects near-infrared light just beyond what human eyes can see and is powerful enough to pierce through thick dust clouds, Webb zoomed into one of the nebula’s signature toe bean structures, the rounded, paw-like shapes that give it its name.
Inside, scientists discovered even smaller mini-toe bean formations, composed of gas, dust, and newborn stars.
WHAT DO WEBB AND CHANDRA REVEAL TOGETHER?
This is where two telescopes become more powerful than one. Webb’s infrared vision and Chandra’s X-ray capabilities capture completely different types of light, and combining them reveals far more than either could alone.
Chandra’s X-ray data, represented in pink and purple, pinpoints extraordinarily young, million-year-old stars so scorching hot they emit X-rays.
Webb’s NIRCam fills in the rest: blue traces the luminous glow of gas energised by massive stars; brown and orange filaments mark thick lanes of cosmic dust; and fiery red clumps show exactly where new stars are actively forming, though still largely hidden from view.
Buried deepest inside these filaments are protostars, baby stars still cocooned in dust, so obscured that even Webb struggles to see them fully.
WHY DO NEWBORN STARS DESTROY THEIR OWN NURSERY?
Here lies the cosmic irony. The very stars being born are also dismantling the conditions needed to make more.
Massive young stars blast out intense radiation, hollowing out cavities in the surrounding gas, a process scientists call stellar feedback.
Webb also spotted bow shocks: ripples in the gas caused by young stars ejecting material at enormous speeds, not unlike the wake left by a speeding boat.
Eventually, this relentless radiation will strip away all remaining gas, switching the nursery off entirely.
The Cat’s Paw Nebula has previously been studied by Nasa’s Hubble and the retired Spitzer space telescopes. Webb and Chandra together now add an extraordinary new chapter to its story.
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