For what reason was Pluto demoted from full planetary status in 2006?
A)because of objects as large or larger than Pluto in the Kuiper belt
B)because Pluto resides outside of the zone that can truly be described as the solar system
C)because Pluto was discovered to be a twin planet system
D)because according to the standard definition,no planet can be smaller than the Earth's moon

Question

Quizplus · Accepted Answer

Pluto was demoted from full planetary status in 2006 because it was discovered that there are objects as large or larger than Pluto in the Kuiper belt. This led to a re-evaluation of what should be considered a planet, and ultimately Pluto was determined to not meet the criteria for a full planet.

For What Reason Was Pluto Demoted from Full Planetary Status