That may be about to change, however. Astronomers have spotted a cloud of gas with a mass about three times that of Earth that's on a trajectory that will have it pass close to Sgr A in 2013*

If this is for real, I am ridiculously humbled by the power of modern astronomy. It's pretty damned amazing to me that we have the ability to detect the location, dimension, and trajectory of a mere 3 earth-masses of thin, amorphous gas 27k light years away, in the noisiest and densest part of the galaxy.