The blackness of black holes is peculiar: although there's plenty of light within a black hole, you can't see it from the outside. Yet there's no wall physically blocking the light or bouncing it back in. Instead, gravity keeps the light contained. —A Black Hole Is NOT a Hole,
Carolyn Cinami DeCristofano

What type of description does the author provide in the passage?

examples
features
personal experiences
emotional

yes

explanation:

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the miracle worker themeswilliam gibson

themes and meanings

(comprehensive guide to drama)

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there are two central themes in  the miracle worker: that the human spirit can triumph over even the most daunting of disabilities and that a dedicated teacher can transform the lives of those with whom he or she comes into contact. these inspirational themes have long been personified in the widely known true-life relationship between helen keller and annie sullivan, but  the miracle worker  also dramatizes collateral issues that extend beyond the particular case. underlying helen’s process of learning basic principles of what annie terms “obedience” (decorum, etiquette, and hygiene), there are more universal lessons of self-governance—the inculcation of self-restraint instead of willfulness, the development of self-discipline instead of self-indulgence. only when these lessons have been mastered can helen begin to acquire language—which, annie says, “is to the mind more than light is to the eye.”