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Kepler's Laws Vocabulary
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Gravity
Terms in this set (14)
eccentricity
the numerical description of an orbit
ellipse
the shape of an orbit
e = 0
a circular orbit
e = 1
an elongated orbit
Kepler's 1st law
all planets orbit in an ellipse
Kepler's 2nd law
planets cover equal areas in equal time
Kepler's 3rd law
states the relationship between the average distance a planet is from the sun and the orbital period
orbital period
the time it takes for an object to orbit the sun once
au
astronomical unit
planets near the sun in orbit
travel at faster speeds and cover more distance
planets far from the sun in orbit
travel at slower speeds and cover less distance
Foci
fixed points at the centers of an ellipse
Perihelion
orbital point closest to the sun
gravitational force
an attractive force that acts between any two objects; keeps planets in orbit
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