What was Percival Lowell’s theory about the ninth planet called?
The Galactic Theory
Planetary Assumption
Lowell’s Hypothesis
The Mars Delusion
Answer
Lowell's Hypothesis was a theory proposed by Percival Lowell in the 19th century that there was a ninth planet in our solar system. Lowell believed that the planet, which he named "Planet X," was responsible for perturbations in the orbits of the outer planets. However, no evidence of Planet X has ever been found, and most astronomers now believe that it does not exist.
The Stellar Genius: How Well Do You Know Percival Lowell?
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