Astronomy
Astronomy Astronomy is the study of celestial objects and phenomena that exist beyond Earth's atmosphere. It is a natural science that seeks to understand the physical properties, behavior, and evolution of the universe, including the galaxies, stars, planets, and other celestial bodies that comprise it. Astronomy encompasses a wide range of topics, from the origin of the universe to the search for extraterrestrial life. Astronomy has been studied since ancient times, with early civilizations using the stars and planets to mark the passage of time and predict seasonal changes. The development of modern astronomy began in the 16th century with the work of Nicolaus Copernicus, who proposed the heliocentric model of the solar system, and Galileo Galilei, who made observations of the heavens using a telescope. Today, astronomers use a range of tools and techniques to study the universe, including telescopes, satellites, and computer simulations. They collect data from across the ...