How do stellar winds and jets stop a young star from gathering more gas?

Newly born stars are highly active, and their growth is regulated by powerful outflows that reverse the process of accretion. These outflows effectively clear the surrounding regions of the gas and dust that would otherwise continue to fall onto the protostar.1

The mechanism manifests in two primary ways:

• Stellar Winds: Newly formed stars blow powerful winds that push against the infalling envelope of gas and dust, eventually reversing the accretion flow.1
• Jets: Matter is ejected in opposite directions along the rotational poles of the star or its surrounding nebular disk. These jets sweep up ambient matter into two lobes of outwardly moving molecular gas, known as bipolar outflows.1

While the exact energy source driving these outflows remains a subject of research, theories suggest that strong magnetic fields coupled with rapid rotation may act like whirling blades to fling nearby gas outward. This process ensures that the infall phase does not run to completion, as these energetic activities clear the immediate environment of the raw material required for further growth.1