Science, Maths & Technology
Astronomy: images of the Universe
...work, objects with magnitude 6 are in fact about 100 times fainter than those with magnitude 1: each decrease of one magnitude corresponds to roughly a 2.5 times reduction in brightness. Using a large telescope, objects as faint as magnitude 25 may be detected. A 25th magnitude star is around a hundred million times fainter than those near the limit of perception for...