1)

**Ellipse**: the set of all points such that the sum of the distance from two points (known as the foci) is a constant

(http://www.dummies.com/how-to/content/how-to-graph-an-ellipse.html)

For more information on ellipses, click on the link here or watch the video below:

3) Real World Application: The path of a comet and the orbits of planets, moons, and artificial satellites are all in the shape of an ellipse.

(http://cse.ssl.berkeley.edu/SegwayEd/lessons/cometstale/frame_orbits.html)

(http://britton.disted.camosun.bc.ca/jbconics.htm)

"Planets, moons, comets, and practically everything in the galaxy revolve around a sun in a fixed path or orbit. Earth's orbit is surprisingly more similar to a circle than an ellipse. But many comets and other planets revolve along more stretched out ellipses with a sun near one end rather than in the center. It's as if the sun was twirling everything on a stretchy rubber band that gets longer and shorter again each time the object comes back around the sun.Orbits can also change over a period of many, many years due to gravity. The longer and narrower the orbit is, the longer it takes for the object to make one complete revolution." (http://cse.ssl.berkeley.edu/SegwayEd/lessons/cometstale/frame_orbits.html)

4) Works Cited:

-http://youtu.be/7mqUYWtRL5Y

-http://www.purplemath.com/modules/ellipse.htm

-http://www.mathopenref.com/ellipsefoci.html

-http://www.dummies.com/how-to/content/how-to-graph-an-ellipse.html

-http://cse.ssl.berkeley.edu/SegwayEd/lessons/cometstale/frame_orbits.html

-http://britton.disted.camosun.bc.ca/jbconics.htm

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