A stunning new image from the JamesWebbSpaceTelescope shows a famous supernova remnant called Cassiopeia A, or Cas A.
When a massive star comes to the end of its life and explodes in a huge outpouring of light and energy called a supernova, it leaves behind a dense core that can become a black hole or a neutron star. But that’s not all that remains after a supernova: the explosion can leave its mark on nearby clouds of dust and gas that are formed into intricate structures.
The image of Cas A was taken using Webb’s MIRI instrument, which looks in the mid-infrared range. Located 11,000 light-years away, Cassiopeia A is one of the brightest objects in the sky in the radio wavelength, and is also visible in the optical, infrared, and X-ray wavelengths. To see the different features picked up in different wavelengths, you can look at the slider comparison of the Webb infrared image alongside a Hubble visible light image of the same object.
Related Videos With Webb’s high sensitivity, new details are visible in this remnant. “Compared to previous infrared images, we see incredible detail that we haven’t been able to access before,” said Tea Temim of Princeton University, a co-investigator of the Webb observation program, which took the image, in a statement.
By studying these details, astronomers can learn about the aftereffects of supernovae — which is particularly important because these explosions create many of the heavier elements in our universe such as silicon, sulfur, and iron.
“By understanding the process of exploding stars, we’re reading our own origin story,” said Milisavljevic. “I’m going to spend the rest of my career trying to understand what’s in this data set.”
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