Comet: Like asteroids, a comet orbits the Sun. However rather than being made mostly of rock, a comet contains lots of ice and gas, which can result in amazing tails forming behind them (thanks to the ice and dust vapourising)
https://www.thesun.co.uk/tech/9758368/nasa-giant-asteroid-alert-skim-earth/amp
Please explain the grammatical form and function of "being made". Why can't we just use than made...?
What does "which" refers to?
One of the most frequent structures after 'rather than' is an -ing clause. These can be active or passive. ) and a past participle.
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One of the most frequent structures after 'rather than' is an -ing clause.
These can be active or passive. If they are passive they consist of being and a past participle, just as the finite passive consists of a finite form of be (is, are, was, were, etc.) and a past participle.
Active
rather than going straight up
rather than exten