Science, Maths & Technology
Galaxies, stars and planets
...law. If star B is 10 times the distance of identical star A, how much brighter would A appear? Star A would appear 10 × 10 = 100 times brighter than star B. In practice, it is not quite so easy to measure distance, because some stars are the same colour but different sizes and so give out different amounts of light - but the general principle of 'faint means far'...