According to some theories about 10 million years ago part of the Heart Nebula would have been crossed by an ionization wave that would have triggered the first phenomena of star formation. As in a chain reaction, these phenomena would later spread to other regions, thus causing the formation of a large number of stars.
According to other theories, however, the star formation inside the nebulae occurred independently and not following a chain reaction.
What is certain is that the ultraviolet radiation and stellar wind produced by the young stars have shaped the gases of the nebulae, making them take on the shape we see today.
Credit: David Lindemann.
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