asteroid vs major planet

asteroid

noun
  • In the Solar system, such a body that orbits within the orbit of Jupiter 

  • Any member of the taxonomic class Asteroidea; a starfish 

  • A naturally occurring solid object, which is smaller than a planet, larger than a meteoroid and not a comet, that orbits a star and often has an irregular shape. 

major planet

noun
  • Any of the 8 celestial bodies which orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune (a celestial body that fits the 2006 IAU definition of planet). 

  • Any planet that is significantly larger and more massive than Earth, containing large amounts of hydrogen and helium, such as Jupiter and Neptune. 

How often have the words asteroid and major planet occurred in a corpus of books? (source: Google Ngram Viewer )