SCIENTISTS STUDY NATURE AT MANY SCALES
FIGURE 1.5 Scientists can study some subjects, such as this tortoise (left), with unaided senses. However, the study of other subjects that are very small, such as the microanatomy of an insect (center), or very large or distant, such as stars and planets (right), require instruments that extend the human senses.
(NASA, ESA, CXC and the University of Potsdam, JPL-