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11 terms

Space & Earth Science 3rd Addition Chap 5 Vocab

Chapter 5 Vocabulary
STUDY
PLAY
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