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What kind of orbit does a comet have?
Comets have a highly elliptical orbits.
When does a comet have the least speed and gravitational pull?
When it is furthest away from the Sun.
What happens when a comet moves closer to the Sun?
The force of gravity increases. Also, the comet speeds up as it “falls” towards the Sun - in other word, as its potential energy is changed into kinetic energy.
The diagram shows the orbit of a comet. At which point is the Suns’s gravitational pull on the comet greatest?
B
The diagram shows the orbit of a comet. At which point is the Suns’s gravitational pull on the comet least?
D
The diagram shows the orbit of a comet. At which point does the comet have the greatest speed?
B
The diagram shows the orbit of a comet. At which point does the comet have least speed??
D
What is a geostationary orbit?
Orbit that matches Earth’s rotation and therefore appear stationary relative to the ground - follows Earth.
What is the period (orbit time) of a satellite in a geostationary orbit?
24 hours
What does communication satellites do?
Beam radio, TV, and other signals from one part of the Earth to another.
Why are communications satellites normally put into a geostationary orbit?
So the dish aerials don’t have to track the satellites, but can point in a fixed direction.
Note 
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