Pic No1: Perhaps the most famous star cluster in the sky, the bright stars of the Pleiades can be seen without binoculars from even the depths of a light-polluted city. With a long exposure from a dark location, though, the dust cloud surrounding the Pleiades star cluster becomes very evident. The above exposure took about 30 hours and covers a sky area several times the size of the full Moon.
Pic No2: Galileo’s drawing of Pleiades. 1610.