Space & Earth Science 3rd Addition Chap 5 Vocab

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Chapter 5 Vocabulary

Planets

Wanders or heavenly bodies that revolve around a star

Ellipse

is the shape of the orbit that planets travel around the sun on

Perihelion

When a planet is closest to the sun

Aphelion

When a planet is farthest away from the sun

Astronomical unit

The earths average distance from the sun is called one astronomical unit

Albedo

the ratio of light reflected by a planet

Mass

a measure of the amount of matter the planet contain

Weight

heaviness of the mass... can change based on gravity

Surface Gravity

A planets size and mass together determine SG

Phases

of a planet is the amount and shape of the planets illuminated surface that is visible from the earth

Transits

a planet passes firectly between the earth and the sun so we see the silhouette against the suns bright disk

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