A painting from 1617 appears to show a type of telescope thought not to have been built until much later. It's hard to find an invention more emblematic of the birth of modern science than the telescope. And yet surprisingly little is known about its early development. The inventor of the telescope remains unknown to this day. Now a study of the paintings of Jan Brueghel the Elder, a Flemish painter of the Baroque era who was working in Amsterdam at the beginning of the 17th century, is throwing some light on the early development of the telescope. It has...