Science, Maths & Technology
Astronomy: images of the Universe
...class of nebulae provided a useful distinction between unresolved (point-like) and resolved (extended) structures. Figure 8 shows some hand-drawn sketches of nebulae dating to the early nineteenth century. It is apparent that they do not all show the same structure: there are various different types of fuzzy, extended – and in some cases a little peculiar – objects...