What triggered the most recent supernova in our Milky Way? We now have a technique to find out. Astronomers had previously identified G1.9+0.3 as the remnant of the most recent supernova in our Galaxy. It is estimated to have occurred about 110 years ago in a dusty region of the Galaxy that blocked visible light from reaching Earth. The new research with archival Chandra X-ray Observatory and the Jansky Very Large Array data examines how the expanding supernova remnant G1.0+0.3 interacts with the gas and dust surrounding the explosion. The resulting radio and X-ray emission provide clues as to the cause of the explosion. We observed that the X-ray and radio brightness increased with time, so the data point strongly to a collision between two white dwarfs as being the trigger for the supernova explosion in G1.9+0.3. Image credit: NASA/CXC/CfA/S. Chakraborti et al. #nasa #space #galaxy #supernova #astronomy #milyway #chandra #nasabeyond #science