Theories of the Universe in the Late Eighteenth Century

Author(s):  
Harry Woolf
Author(s):  
Robert W. Smith

The first detailed and extensive studies of nebulae were made by William and Caroline Herschel in the late eighteenth century. These researches led to wide-ranging debates on the nature of these objects: are they truly clouds of nebulous material or are they perhaps distant star systems? By the end of the nineteenth century, astronomers generally agreed that nebulae are either within or closely linked to our own stellar system, and that no galaxies beyond our own Galaxy had been sighted, even in the largest telescopes. But early in the twentieth century, astronomers managed to fashion novel ways to determine the distances to a class of nebulae known as spiral nebulae. With the aid of these distance indicators, the spiral nebulae were transformed into galaxies of stars. Modern extragalactic cosmology thereby came into being in the first few decades of the twentieth century.


Author(s):  
Will Smiley

This chapter explores captives’ fates after their capture, all along the Ottoman land and maritime frontiers, arguing that this was largely determined by individuals’ value for ransom or sale. First this was a matter of localized customary law; then it became a matter of inter-imperial rules, the “Law of Ransom.” The chapter discusses the nature of slavery in the Ottoman Empire, emphasizing the role of elite households, and the varying prices for captives based on their individual characteristics. It shows that the Ottoman state participated in ransoming, buying, exploiting, and sometimes selling both female and male captives. The state particularly needed young men to row on its galleys, but this changed in the late eighteenth century as the fleet moved from oars to sails. The chapter then turns to ransom, showing that a captive’s ability to be ransomed, and value, depended on a variety of individualized factors.


Sign in / Sign up

Export Citation Format

Share Document