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The dust needed help coming together fast, in kilometer-wide protoplanets, in the first few million years after a star was born, or the stellar wind would blow it all away.
They are characterised by high masses, strong stellar winds , and accreting material from the companion star leading to a ‘cocoon’ around the compact source.
Such a massive star has strong stellar winds that can clear away the gas around it and form a wind-blown bubble.
But if a breeze blows through it - say, a stellar wind from a giant star nearby - the gas is driven outward.
An aging star sheds its outer layers of gas through stellar winds .
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