Which planet has been excluded from the list of planets in the solar system?

by

(A) Venus
(B) Pluto
(C) Mars
(D) Mercury

🧠 Explanation:

  • Pluto was originally considered the ninth planet of the solar system after its discovery in 1930.
  • In 2006, the International Astronomical Union (IAU) redefined the criteria for a full-fledged planet.
  • Pluto did not meet all the new criteria (especially clearing its orbit), so it was reclassified as a "dwarf planet."
  • Therefore, Pluto is the correct answer — it was excluded from the official list of planets.