A) ozone layer
B) super dense planetary material
C) upper surface of atmosphere
D) none of the above
Correct Answer: B
Solution :
When a star considerably larger than our sun burns out, the gravitational force between all its particles can cause the star to collapse on itself and thereby to form a black hole. The gravitational force at the surface of such a collapsed star is so strong that neither particles nor light can escape from its surface (thus the term black hole). Any star coming to near a black hole can be ripped apart by strong gravitational force and pulled into the hole. So, a black hole consists of super dense planetary material.
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