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@JeffUK It's just in case a planet has exactly one spherical satellite. If the planet's inhabitants aren't capable of interplanetary spaceflight, they would call it simply 'the Moon'.
@RobJeffries I don't think it's a duplicate either because this question includes brown dwarfs and focuses on the entire sky. My question is on planets circling T9V to M2V stars in the habitable zone. I'm actually quite surprised that if there isn't a blue light in the star's spectrum you can't see blue in its system anywhere at all.
@RobJeffries You state that the sky rather isn't blue in the line of sight towards the red dwarf Sun, but elsewhere (such as close to horizon) it would still look blue?
When we say something is a "dwarf ..." it is actually that thing; the 2006 definition on "dwarf planets" is the only dumb exception. As if the term "planetoid" wouldn't exist or they'd be unable to invent a term like "underplanet" or "subplanet" or classify them under the already extant term "protoplanet".
Can the downvoter explain their vote? It's not like the answer was obvious, the atmosphere doesn't end abruptly (unless you consider the boundary where the homopause ends or at the exobase, but the question is whether it's one of them perhaps).
@CriglCragl The Sun cannot explode because it by far hasn't enough mass to go supernova. You probably mean the ejection of its planetary nebula, becoming a white dwarf.
