G1.9+0.3

G1.9+0.3 is a radio source (RS, its identifier "G1.9+0.3" consists of its galactic coordinates) that is a supernova remnant of a supernova presumed to have occurred in the decades circa 1900, and is the youngest SN remnant known, i.e., the result of the most recent known Milky Way SN. The SN was not observed, apparently due to cosmic dust obscuration. The remnant's age is estimated by the observed expansion of its angular diameter since the RS's discovery. The RS was discovered and considered a SN remnant candidate in 1984, and further observation in 2008 confirmed the theory. The SN is thought to have been a Type Ia supernova.