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study of the universe (Earth as a planet & beyond)


a collection of star systems. large group of stars, dust, and gas held together by gravity.

Solar System

sun, planets, and all the other objects that revolve around the sun.

Local Group

a group of about 30 galaxies that includes the Milky Way.

Astronomical Unit (AU)

A unit of length used for distances within the solar system.

Light Year (LY)

the distance light travels in one year.


the central part of the Earth.

Radiative Zone

Region that surrounds core of sun.

Convection Zone

outermost layer of the sun's interior.


the intensely luminous surface of a star (especially the sun).


a gaseous layer of the sun's atmosphere that is visible during a total eclipse of the sun. The middle layer of the sun's atmosphere. Layer of the sun's atmosphere above the photosphere.


the outermost region of the sun's atmosphere.

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