 The effect of the sort of superflare apparently found on the original nine candidate stars would be catastrophic for the Earth and would leave traces on the Solar System; the event on S Fornacis for example involved an increase in the stars' luminosity by a factor of about twenty.Thomas Gold suggested that the glaze on the top surface of certain lunar rocks might be caused by a solar outburst involving a luminosity increase of over a hundred times for 10 to 100 seconds at some time in the last 30,000 years.Apart from the terrestrial effects, this would cause local ice melting followed by refreezing as far out as the moons of Jupiter.