For distant stars, astronomers estimate the distance by comparing the intensity of light coming from these stars with the intensity of similar stars at a distance of 10 parsecs (1 parsec = 3.09 * 1016m). What is the intensity of the Sun at 10 parsecs? How far (in parsecs) from the Earth is a similar star, which has a magnitude number greater by 3 than the Sun observed from 10 parsecs? (A higher by one magnitude number star corresponds to a 2.5 times lower light intensity from the star. Stars with lower magnitude numbers are higher).