Pre-main-sequence star

Rarity: Uncommon

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What Wikipedia says

A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence. Earlier in its life, the object is a protostar that grows by acquiring mass from its surrounding envelope of interstellar dust and gas.

Excerpt from the Wikipedia article “Pre-main-sequence star”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration, Public domain, via Wikimedia Commons.