Astrobiology is the application of the science of biology to the universe and everything in it. This branch of astronomy is very new. The serious use of biology to study the cosmos has blossomed in recent years, however, and has become very important in the field as a whole. With modern astronomical methods and technology, it has become scientifically feasible to search for extraterrestrial life, look for environments where such life could exist, and study how such life could develop.