Supernova remnants (SNRs) are diffuse, expanding structures that form after a supernova explosion. They contain the ejected material that expanded after the explosion, as well as interstellar material captured by the shock wave.
Until now, only eight oxygen SNRs were known in our galaxy and the Magellanic Clouds, and their relationship to specific supernovae was not fully understood. Now, thanks to the new method, scientists have been able to detect many new remnants, including oxygen.
Of the 307 SNRs detected, 35 showed oxygen emission, and seven of these were found to be particularly oxygen-rich.
Source: Ferra
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