Are Planets Capitalized?

The names of planets are capitalized since they are proper nouns referring to the planets in our Solar System or other solar systems. Therefore, you should capitalize the following planets and dwarf planets:

  • MErcury
  • Venus
  • Earth
  • Mars
  • Jupiter
  • Saturn
  • Uranus
  • Neptune
  • Pluto

What about the word planet?

The word “planet” is generally not capitalized since it is a common noun that refers to any planet. The only time you should capitalize “planet” is if it is used in a title such as the name of the seven-movement orchestral suite called “The Planets” by composer Gustav Holst.

Do you capitalize solar system?

Generally the phrase “solar system” is lowercase except when you are referring to the solar system that we live in. In that case, you should refer to our Solar System in capital letters.

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Capitalize My Title is a dynamic title capitalization tool used to make sure your titles or headlines use proper capitalization rules according to various style guides include APA, AP, MLA, and Chicago. It also counts your words and checks for grammar issues.


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