Astronomy - The scientific study of celestial objects, space, and the physical universe as a whole, Astronomer - An expert in the study of the stars, planets, galaxies, etc., Cosmos - The universe as a well ordered whole, Crescent moon  - How the moon appears at it's first or last quarter , Eclipse - An obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination., Equinox - The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20)., Galaxy - A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction., Gravity - The force that attracts a body toward the center of the earth, or toward any other physical body having mass., Orbit - The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution., Rocket - A cylindrical projectile that can be propelled to a great height or distance by the combustion of its contents, Solar System - The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets., Universe  - All of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.,

Astronomy Vocabulary

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