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### 18 Cards in this Set

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 ellispe oval shape in which the planets revolve around the sun foci two fixed points within the ellipse what is located at one of the foci the sun eccentricity the amount of difference btween an ellipse as compared to a special type of ellipse called a circle eccentricity formula eccentricty = distance between foci -------------------- length of the major axis what would the orbits of the planets to scale look like to the human eye? like circles, except for mercury and pluto when is the earth closest to the sun? on or about january 3 when is the earth farthest away from the sun on or around july 4 does the distance from earth to the sun cause the seasons? NO inertia the concept that an object at rest will tend to remain at rest, and that an object in motion will maintain the direction and speed of that motion unless an opposing force affects it gravitation the attractive force that exists between any two objects in the universe how does mass affect gravity the great the mass of one or both objects, the greater the gravitational attraction how does distance affect gravity the closer the objects are the greater the gravitational attraction what is an example of the dynamic equilibrium between inertia and gravitation the orbit of a planet around the sun when a planet is closer to the sun, its orbital speed velocity... is greatest when a planet is farthest away from the sun, its orbital speed velocity is... slowest how does the distance from the sun affect a planets orbit? the closer a planet is to the sun, the smaller its orbit, the shorters its period of revolution, and the faster its speed of revolution when the foci are closer together, the orbit is more or less eccentric? more eccentric