  Recent radio observations of the small Galactic supernova remnant G1.9+0.3
made at 4.86 GHz with the VLA are presented, and compared with earlier
observations at 1.49 GHz which have a comparable resolution (10 x 4 arcsec^2).
These show that the radio emission from this remnant has expanded
significantly, by about 15 per cent over 23 years, with a current outer
diameter of approximately 92 arcsec. This expansion confirms that G1.9+0.3 is
the youngest Galactic remnant yet identified, only about 150 years old at most.
Recent, lower resolution, 1.43-GHz observations are also discussed, and the
integrated flux densities from these and the 4.86-GHz observations are compared
with earlier results. This shows that the integrated flux density of G1.9+0.3
has been increasing recently.
