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The Orion Nebula is lit up by true stellar monsters; O-type stars that are tens of times the mass of our sun with surface temperatures up to 50,000 K. These massive stars power the nebula and, when they explode as supernovae, have the capacity to shut down star formation or jump-start it in a new region.
In this case, the O-stars are destroying the proplyds that form too close, stripping them of the gas and dust that otherwise would have formed planets. In just a few million years, the proplyds within one light-year of an O-star are stripped bare.
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This has consequences for the number of planets that can exist in our Galaxy. Many stars, including our sun, probably formed in a massive star-forming region like the Orion Nebula. How many potential solar systems were destroyed before they even had a chance to start? Surely, some were far enough away from any O-star to survive, as evidenced by the thousands of exoplanets that we've found already, not to mention our own existence.