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15 terms

Science Vocabulary 1-7

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