why is the earth usually go a round the sun

Question: why is the earth usually go a round the sun
- Keywords:
  earth,
  sun
Asked by princess carbon to Sammy on 12 Jul 2017. This question was also asked by MIMMY.
- Sammy Wambua answered on 12 Jul 2017:
  
  Hi Princess Carbon,
  
  Thanks for the brilliant question.
  
  It is believed that the earth started to rotate because it was formed (as well as the rest of the solar system) within a cloud of hydrogen that collapsed down ((4.54 billion years ago) from its mutual gravity. As it collapsed, the cloud began to spin and continues to spin to date to conserve its angular momentum. Angular momentum is simply the fact that things tend to rotate.
  
  I know you might wonder that there how come there is no force continually “pushing” the earth to keep it moving, and why does it not slow down. Actually, if something is moving, it doesn’t require force to keep moving, it requires force to stop! Otherwise, it will slow down and eventually stop i.e. “Objects in motion tend to stay in motion. Objects at rest tend to stay at rest.”
  
  Again, thanks Princess. Keep your questions coming!

Caroline commented on 12 Jul 2017:

Hi Princess,

The earth and other planets rotate around/orbit around the sun because the gravity of the sun keeps them in their orbits. If the Sun weren’t there, the earth would travel in a straight line. But the gravity of the sun alters its course, causing it to travel around the sun, in a shape very near to a circle.

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Question: why is the earth usually go a round the sun