|Limitations of the
The human eye is a remarkable biological invention, a shining triumph of the process of evolution. Although the human eye was the detector that started us on mankind's exploration of the Cosmos, it has some shortcomings that ultimately limit that exploration:
Astronomers have developed a variety of instruments and techniques to supplement the human eye and to alleviate these shortcomings. As a result, in modern research astronomy, very few observations are made any more by an astronomer looking directly through an optical telescope.