• Orbit – the path that a planet follows around the Sun (or any other celestial body). • Planetary orbits are most commonly in the shape of ellipses, but can be circular, and usually involve a focus point that they orbit around. • Planetary orbits are also seen to “sweep out equal areas in equal times”. When a planet is farther from its focus point, it tends to move slower than when it is located near its focus point. • The above point can be represented through Kepler’s equation of planetary motion which states that: (how long the orbit takes) ^2 = (how big the orbit is) ^3. • Newton’s law of gravity is given by: Force = ((Gravitational constant)*(mass of object 1)*(mass of object 2))/ (the distance between the two objects) ^2. • The force of gravity is always attractive and is also the weakest natural force that scientists have discovered in the universe. • The energy that is associated with gravitational force in our universe is also known as binding energy. This type of energy simply defines the idea of being
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