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The study of the movement of air and how objects move through air.
aerodynamics
The science or practice of building and flying aircraft.
aeronautics
A form of physical exercise that improves the efficiency of the body's cardiovascular system by using oxygen.
aerobics
An instrument used to measure the density or weight of air or gases.
aerometer
The branch of technology and industry concerned with aviation and space flight.
aerospace
The study of airborne microorganisms, pollen, spores, and other biological particles.
aerobiology
An abnormal fear of flying or drafts of air.
aerophobia
A suspension of fine solid particles or liquid droplets in air or another gas.
aerosol
A person trained to travel and perform tasks in outer space.
astronaut
The scientific study of celestial objects, space, and the universe as a whole.
astronomy
The study of the origin, evolution, distribution, and future of life in the universe.
astrobiology
The study of the chemical composition and processes in stars, planets, and interstellar space.
astrochemistry
Relating to astrology, which is the belief or study that the positions of celestial bodies can influence human affairs and natural events.
astrological
A belief system that suggests a relationship between the positions of celestial bodies and events on Earth, especially human lives.
astrology
The science of measuring the positions, motions, and distances of stars and other celestial objects.
astrometery
A type of telescope specially designed for taking detailed photographs of the night sky.
astrograph
