Section: Science

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Which one of the following statements is NOT backed with an explanation?

1. Pluto is not an asteroid.
2. Pluto is like a planet.
3. Pluto is like Mercury.
4. Pluto should be grouped with planets known as gas giants.
5. Pluto is not a comet.

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.