the point along a planet's orbit at which it is farthest from the Sun
a closed curved line on which all points are of equal distance from its center
a mechanical device used to draw circles
A shape like a stretched-out circle; an oval
the point at the center of a circle
the attractive force between objects
the elliptical path that a satellite travels as it moves around a star or planet
the point along a planet's orbit at which it is nearest to the Sun
the distance on a circle from the focus to the circumference
a relationship between two measurements
the distance between objects when compared with the distance between surrounding objects
an object in orbit around a larger object
a group of items that form a unified whole
the distance from one side of a circle, through the focus, to the other side
a large, spherical satellite of a star
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