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Largest planets likely formed first from icy “planetary pebbles” From Astronomy Now: This artist’s concept of a young star system shows gas giants forming first, while the gas nebula is present. Southwest Research Institute scientists used computer simulations to nail down how Jupiter and Saturn evolved in our own solar system. These new calculations show that the cores of gas giants likely formed by gradually accumulating a population of planetary pebbles — icy objects about a foot (30…

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#Space: #Mercury, the smallest planet, is getting even smaller, scientists say ► via @Natalie Jost Jost Brewer and via @Maxime Dehaye Duprez