Based on perturbations in Neptune's orbit, the search for a ninth planet was conducted and Pluto was discovered in 1930. Pluto orbits the sun just like the other eight planets, and it has a moon. Charon, and a stable orbit. Based on its distance from the sun, Pluto should be grouped with the planets known as gas giants. In addition, Pluto, like the planet Mercury, has little or no atmosphere. Pluto is definitely not a comet because it does not have a tail like a comet when it is near the sun. Pluto is also not an asteroid, although its density is closer to an asteroid than to any of the other planets. Pluto is a planet because it has been classified as one for more than sixty years since its discovery.Which of the following statements is not backed with an explanation?

Correct answer: D. Pluto is not an asteroid

A. Pluto is like a planet
B. Pluto should be grouped with planets known as gas giants
C. Pluto is like Mercury
D. Pluto is not an asteroid
E. Pluto is not a comet

Explanation

The passage states that Pluto's density is closer to an asteroid's than to any of the planets'. This would lead the reader to think that Pluto, based on its density, may be an asteroid. But the passage states that this is not the case and does not give arguments to support the statement. The statements in all other choices are supported with facts.

Last updated 3 September 2026

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