It is the youngest-known SNR in the Milky Way, resulting from an explosion the light from which would have reached Earth some time between 1890 and 1908.

[1] The explosion was not seen from Earth as it was obscured by the dense gas and dust of the Galactic Center, where it occurred.

[6] Further observations made with the VLA in 2008 verified increase in size, implying it is no more than 150 years old.

[7] A more recent estimate put its observable age at 110 years as of the data collection in 2008.

[3] The discovery that G1.9+0.3 had been identified as the youngest-known Galactic SNR was announced on May 14, 2008 at a NASA press conference.