Pluto's atmospheric pressure fluctuates. Inferring factors from observations of stellar eclipse Studies in the Middle East
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Even so, it has a larger apparent diameter than a star that can only be seen at a point far away, so if Pluto passes in front of a star other than the Sun, it will always obscure the star.
According to Wikipedia, occultation is "when one celestial body (A) passes between an observer and another celestial body (B) ... → Continue reading
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