A dead comet that doesn't chafe

In space, no one can hear you chafe.

You didn't know that? Well then, why else would dead comets be covered in talcum powder?

Or at least it appears that one dead comet may have a layer of talcum-powder-like grains on its surface, presumably so it can stay comfortable despite the sticky heat of being out in the Sun all the time.

The comet in question is called P/2016 BA14 (PANSTARRS)*. Discovered in 2016, it was initially thought to be an asteroid, but then very weak cometary activity was see...