I recenty got my essay back from my teacher and she said that it was wrong to use upper case "Earth". When I'm writing Earth, I'm referencing to the planet Earth, not soil. This is the sentence which included "errors". She gave me an error in every word that I marked with strong first letter.
This is why the Moon orbits the Earth, and the Earth orbits the Sun, and the Sun orbits the black hole in the middle of the Milky Way.
Who is right, me or her?