Physics or physics (referred to as physics) (English: physics, from Ancient Greek: φύσις meaning knowledge of nature) is a natural science that focuses on the study of matter and its motion through space and time, along with related concepts such as energy and force. Physics is one of the oldest sciences, with the aim of understanding the motion of the universe.
Physics is one of the earliest academic disciplines, and perhaps the earliest when combined with astronomy. Over the past two millennia, physics has been part of natural philosophy along with chemistry, some specific branches of mathematics and biology, but during the Scientific Revolution that began in the seventeenth century, the natural sciences emerged as separate branches of study independent of each other. Physics intersects with many different interdisciplinary fields of study, such as biophysics and quantum chemistry, the limits of which are also unclear.