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Do you know the number for ? doxycycline 100mg dosage for bronchitis A non-spinning or retrograde (back-spinning) comet is more likely to survive because the "backspin" cancels out some of the tidal forces nearest the Sun. The opposite effect would be seen if the comet were spinning prograde, similar to a tennis ball with topspin. In that case, the spin direction would increase the tidal forces at the surface nearest the Sun and aggravate the disruptive potential, even for a comet of far greater density. The faster the prograde rotation and the lower its density, the greater the chances of a comet's disruption.
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