[SunkenCiv]

While comets *may* be billions of years old, they only spend a few days or weeks in proximity to the Sun during each of their orbits.

[going hot]

Interesting, a few days to weeks. I was under the impression that some took a while, perhaps a few months, to finish the perihelion stage before heading out.

Still others would sport an ion trail while still quite a bit out there , more than a few weeks, on approach.

Going to have to go back to my learnin' and retune my memories.

Thank you for the information.