: If you’re using it in formal writing, define it. If in fiction, it’s evocative and clear enough within the right scene. For scientific use, replace with precise terms like “cold dark matter halo” or “non-luminous cold shell.”
There are several possible interpretations of a Cold Dark Shell: cold dark shell meaning
The space has no HVAC system (heating, ventilation, or air conditioning) installed or distributed. : If you’re using it in formal writing, define it