What external influence is suggested to be the primary driver for up to 90% of observed long-period comets?
Answer
The Galactic Tide
Statistical models suggest that the cumulative, gentle gravitational distortion exerted by the entire Milky Way galaxy, known as the galactic tide, may be the primary driver for up to 90% of the long-period comets we observe.
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The Oort Cloud: Crash Course Astronomy #22 - YouTube
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