Hubble skillfully imaged the expanding shell of gas and dust of the Cygnus Loop into space.
targeted on small section of this growing supernova bubble, precisely where the explosion’s shockwave collides with the surrounding space material.
Hubble's images and data were critical in calculating how fast the supernova's shockwave has been expanding. "Hubble is the only way that we can actually watch what's happening at the edge of the bubble with such clarity. The Hubble images are spectacular when you look at them in detail. They're telling us about the density differences encountered by the supernova shocks as they propagate through space, and the turbulence in the regions behind these shocks," said Ravi Sankrit, an astronomer at the Space Telescope Science Institute in Baltimore, Maryland, in the press release.
As the shockwave travels from the explosion site to the interstellar medium, it triggers a reaction in which the "invisible neutral hydrogen" is heated to temperatures of one million degrees Fahrenheit. As electrons get charged and produce photons, the superheated gas begins to emanate a radiant light.
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