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drbribri06
In some nebulae, stars form out of large clouds of gas and dust; once some stars have formed inside the cloud, their light illuminates the cloud, making it visible to us. These star formation regions are sites of emission and reflection nebulae, like the famous Orion Nebula shown in the picture on the right.hope I helped
In some cases, stars form from large clouds of gas as well as dust. Once the star forms within these clouds of gas and dust the light of the star illuminates the cloud making it now visible to humans.