The study of the motion of stars and other objects in space based on the laws of physics and gravity

The study of the spectra of celestial bodies in order to determine their chemical composition and physical properties

An optical instrument used for observing celestial bodies, often with high magnification; includes refracting, reflecting, and catadioptric types.

the study of the origin and evolution of the universe and celestial bodies

The science that applies the methods and theories of physics to study the structure, chemical composition, and evolution of celestial bodies.

A social camp or site where members practice nudism as a way to return to nature; participants are expected to remain naked while at the camp.

artificial satellite; man-made celestial body

near-Earth object; any small solar system body whose orbit brings it into proximity with Earth

nudism; naturism