BBC Earth (Asia) - - Update -

As­ter­oids and comets were born dur­ing the early days of the So­lar Sys­tem. As­ter­oids formed closer to the Sun and are made up of met­als and rocky ma­te­rial. Comets formed fur­ther away and con­sist of ice, dust and rocky par­ti­cles. It is the melt­ing of the ice as a comet ap­proaches the Sun that gives

it a dis­tinc­tive tail.

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