The gas and dust cocoon surrounding young stars a. is blown away when the young stellar surface heats up and becomes more luminous. b. remains surrounding the young star throughout its adult life. c. eventually collapses onto the star, increasing its mass and luminosity. d. evaporates gradually over the lifetime of the star. e. expands as the star’s luminosity increases eventually reaching a distance far enough that it condenses to form comets.

The gas and dust cocoon surrounding young stars a. is blown away when the young stellar surface heats up and becomes more luminous. b. remains surrounding the young star throughout its adult life. c. eventually collapses onto the star, increasing its mass and luminosity. d. evaporates gradually over the lifetime of the star. e. expands as the star’s luminosity increases eventually reaching a distance far enough that it condenses to form comets.

	a.	is blown away when the young stellar surface heats up and becomes more luminous.
	b.	remains surrounding the young star throughout its adult life.
	c.	eventually collapses onto the star, increasing its mass and luminosity.
	d.	evaporates gradually over the lifetime of the star.
	e.	expands as the star’s luminosity increases eventually reaching a distance far enough that it condenses to form comets.