QUESTION TEXT: Astronomers have long thought that the irregularity…
QUESTION TYPE: Most Strongly Supported
FACTS:
- Astronomers used to think that Pluto caused Neptune’s irregular orbit.
- But now they think Pluto is too small.
ANALYSIS: There must be something else pulling on Neptune that causes its irregular orbit. We can’t say for sure what it is.
___________
- It doesn’t have to be true that Neptune is bigger than we thought. Pluto is smaller than we thought, and that’s ok.
- We have no evidence that scientists have changed their view how irregular Neptune’s orbit is.
- This could be true, but it doesn’t have to be a planet that pulls on Neptune. It could be something else, like an asteroid belt.
- CORRECT. There must be some additional cause of Neptune’s irregular orbit, since Pluto is too small.
- We now think Pluto is smaller than we used to think it was. But we have no evidence that we’ll discover Pluto to be even smaller in the future.
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