Which celestial body was considered as a planet till 2006 and not a planet after that?

Correct option is B

The correct answer is (b) Pluto.
· Pluto was considered the ninth planet in our solar system until 2006. However, in 2006, the International Astronomical Union (IAU) redefined the criteria for what constitutes a planet, and Pluto did not meet these new criteria.
· As a result, Pluto was reclassified as a dwarf planet. This decision was made because Pluto did not "clear its neighboring region of other objects," which is one of the key requirements for a celestial body to be classified as a planet.
Information Booster:
· Mercury: Mercury is the smallest and innermost planet in the solar system, and it continues to be classified as a planet.
· Jupiter: Jupiter is the largest planet in the solar system and remains classified as a planet.
· Venus: Venus is the second planet from the Sun and is still considered a planet.