Forget Planetesimals, Think Pebbles
This article in The Atlantic magazine describes how theories on planet formation are moving away from the merging of planetesimals to the accretion of pebbles. Apparently this explains why Uranus and Neptune are ice giants while Jupiter and Saturn are gas giants.
My qualifications are rather absent in this subject, so read the article and come to your own conclusions.
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| An artist's rendition of a star surrounded by a protoplanetary disk |
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