Bubble formation
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by
bunda
Do we know if the bubbles are form of uniform ejection from the new star or gases coalescing around the new star, perhaps by gravitational forces?
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by
skendrew
scientist, admin
As far as we understand it, the majority of bubbles are formed when a young massive star, or a cluster of them (they tend to form in clusters), starts heating and ionising the gas in its parent cloud. This hotter material slowly expands into the cloud around it. The most massive stars in addition actively eject material from their own envelopes, and this can sweep up material around it into a bubble. Some bubbles will be different in nature, like the ejected remnants of a dying star (a planetary nebula), or the remnant of a past supernova explosion. But in our experience with these images, most of the bubbles formed around newly formed massive stars or clusters.
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