Question

pluto was removed from the list of planets because a planet is now defined as an object that

• orbits the sun.
• is large enough to have become round due to the force of its own gravity.
• dominates the neighborhood around its orbit.

pluto does not dominate its neighborhood.

what is the most likely reason for changing the classification of pluto?

○ a new scientist decided to change the definition of planet.
○ new information developed about objects in space.
○ updated technology revealed nothing new about pluto.
○ scientists wanted to publish new discoveries about space exploration.

Explanation:

• Option A is incorrect because scientific classifications are not changed by an individual's decision but by evidence and consensus.
• Option B: The re - definition of a planet (requiring it to dominate its neighborhood) came from new understanding and information about celestial objects, including Pluto's orbit and neighboring objects. This new information led to the change in classification.
• Option C: Updated technology has revealed new information about Pluto and other space objects, so this option is wrong.
• Option D: The change in Pluto's classification was due to scientific evidence, not a desire to publish new discoveries.

Answer:

B. New information developed about objects in space.