Question

which section highlights the idea that gravity plays an important role in studying black holes?
a \how do black holes form?\
b \if black holes are black, how do scientists know they are there?\
c \will the sun ever turn into a black hole?\
d \how is nasa studying black holes?\

Explanation:

Black holes cannot be directly observed, so scientists detect them by observing the strong gravitational effects they have on nearby matter (like stars, gas clouds) and light. The section titled "If Black Holes Are 'Black,' How Do Scientists Know They Are There?" would focus on these indirect detection methods, which rely heavily on gravity's role. Other sections focus on formation, stellar evolution of the Sun, or NASA's study methods, which do not center on gravity's key role in detecting/studying black holes as directly.

Answer:

B. "If Black Holes Are 'Black,' How Do Scientists Know They Are There?"