planets

     

A planet, as efined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.[a]

Trivia about planets

  • David Rittenhouse invented a device in 1767 showing the positions of several of these in the solar system
  • Astronomically, remember "My very excellent memory just served up nine" these
  • In 1992 Alexander Wolszczan discovered the first ones of these outside our solar system
  • Get spacy earning the Girl Scout badge the "Power" of these orbiters
  • Launched in 2009, the Kepler mission looks for the tiny dimming of stars as these pass in front of them
  • In 2006 Mike Brown of Caltech declared, "there are finally, officially, 8" of these
  • "MMVENUSJ" is a mnemonic for the size of these, from smallest to largest (it recently lost its "P")
  • Remember this out-of-this-world group with "My Very Educated Mother Just Served Us Noodles"
  • Before a 1992 discovery, we thought only the sun had these; now we know that PSR B1257 + 12 does too

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