New answers tagged comets
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About 0%. If they experience drag by the Sun's atmosphere, they desintegrate due to tidal stress (internal strength of comets is ~Pa < kPa, e.g. Heinisch et al (2019)).
What does have an influence is the (increased) outgassing and mass-loss at perihel which is often not uniform - even well outside the Sun's atmosphere.
On the hand, gravitational influence ...
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