Estimate the luminosity of a 1 solar mass protostellar cloud, which collapses from an initial radius of 10^3 au down to a solar radius, over a timescale of 40 million years by radiation of its gravitational potential energy, in the units of the present solar luminosity:
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Estimate the luminosity of a 1 solar mass protostellar cloud, which collapses from an initial radius...
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