Astronomers estimate that a supernova explosion should occur about every 50 years on average in the Milky Way galaxy. The object known as CTB 37A is a supernova remnant located in our Galaxy about 20,000 light years from Earth. This image shows that the debris field glowing in X-rays (blue) and radio waves (pink) may be expanding into a cooler cloud of gas and dust seen in infrared light (orange).
Image Credit: X-ray: NASA/CXC/Morehead State Univ/T.Pannuti et al; Radio: Molonglo Obs. Synthesis Tel.; Infrared: NASA/JPL-Caltech
Explanation from: https://www.nasa.gov/mission_pages/chandra/ctb-37a.html
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