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In mathematics, parity is the property of an integer of whether it is even or odd. 
An integer's parity is even if it is divisible by two with no remainders left, and its parity is odd if it isn't; that is, its remainder is 1. 

An astronaut (or cosmonaut) is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.

Although generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and tourists.
 

An astronaut (or cosmonaut) is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.

Although generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and tourists.

An astronomer is a scientist in the field of astronomy who studies stars, planets, moons, comets, and galaxies, as well as many other celestial objects.

A related but distinct subject, cosmology, is concerned with studying the universe as a whole. An astronomer researches the world beyond Earth.

A chemist is a scientist trained in the study of chemistry. Chemists study the composition of matter and carefully describe the properties in terms of quantities, with detail on the level of molecules and their component atoms. In addition, chemists carefully measure substance proportions, chemical reaction rates, and other chemical properties.