Mass Transfer Rate I. A black hole with a mass of 4 million solar masses would have an event horizon with a size on the scale of this diagram smaller than the period at the end of this sentence. A slow dribble of only 0.0002 solar mass of gas per year flowing into the black hole could produce the observed energy. Using the mass transfer rate given in solar mass per year, find the mass transfer rate in kg⁄s. Express your answer in scientific notation and to two significant digits.