“…its coma—the diffuse cloud of dust and gas surrounding the object.”
So, its atmosphere.
“,,,back in time, which is a period of time we can’t really observe anymore,”
Astute observation.
“…these objects have largely remained unchanged since the Solar System was formed,…”
They know this how? (“...back in time, which is a period of time we can’t really observe anymore). But: “They are undergoing transformation driven by solar heating…”
They’ve “largely remained unchanged since the Solar System was formed” but are just now “undergoing transformation driven by solar heating”?
Trust the Science.
Maybe being snowbound is affecting my attitude.
I’m curious how these can be ‘unchagned’, yet are off-gassing and have comas.
Is there a presumption that they are regathering that offgassed material, or how is it being replenished?
Missing piece of the equation here.