For mass the adjectives are heaviest/lightest, for size it's largest/smallest.<quoted text>
Big and Small are adjectives and refer to the noun. Since the noun was 'thing' which has properties of both volume and weight, the subjective part was ambiguous. However, since the CONTEXT was in terms of AGW heating, big has to refer to mass since volume is irrelevant to thermal energy. A universe of empty space would have NO thermal energy no mattter how 'big' it was in terms of volume. Yuo continue to amaze me with your ability to get even the simplest things so clearly wrong.
English, you must learn english.