- 1、Cometsaresimilarincompositiontothegasgiants.2、Comets,bycontrast,arerelativelypristine-atleast,belowtheiroutercrust.3、Cometsarejustasmuchmembersofthesun'sfamilyas(are)theotherplanets.4、CometswereformedaroundthesametimetheEarthwasformed.5、Comet...
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