Discussion :: Universe
- The orbits of planets around the Sun, or of satellites around the Earth, can be ________
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A.
Circular and elliptic |
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B.
Circular and hyperbolic |
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C.
Elliptic and parabolic |
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D.
Parabolic and hyperbolic |
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Answer : Option A
Explanation :
All the planets are satellites around the Sun. Almost every ship launched from Earth can be considered a satellite, as it is orbiting either the Earth or the Sun. Even though a space probe is going "out" from the Earth to Jupiter, it is still in orbit around the Sun, so it is still a satellite. It is certainly possible to set up a satellite so that it has a circular orbit (a circle is just an ellipse whose foci coincide). Gravity can only pull in the direction toward the planet.
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