What mechanism concludes the planet construction phase by clearing away the remaining light gases and dust from the protoplanetary disk?

Answer

Intense radiation and solar wind from the fully ignited central star

The process of construction ends when the central star fully ignites, emitting strong radiation and a powerful solar wind that effectively blasts away the leftover light gases and dust from the surrounding protoplanetary disk.

What mechanism concludes the planet construction phase by clearing away the remaining light gases and dust from the protoplanetary disk?

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Formation of the Planets - YouTube

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