Understanding the concept of the effects on an orbit

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I am having trouble understanding the concept of the effects on an orbit. The question asks if we replaced the sun with a rock of the same mass, would Earth's orbit change? I think it doesn't because orbits don't change because of its orbital energy. but i'm not sure because i wonder if the kinetic and gravitational energy would change and thus affect the orbit?
 

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  • #2
Dick
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What effect keeps the earth in orbit?
 
  • #3
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i thought orbital energy keeps it in orbit
 
  • #4
Dick
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Wrong. A force keeps it in orbit. Not an energy. Which force?
 

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