Black holes cannot be observed directly, because they emit no light. However, a scientist can hunt for black holes because
A) a black hole will reflect light.
B) a black hole can still emit electrons.
C) black holes can gravitationally influence the orbits of nearby stars, and those stars can be observed.
D) magnetic fields cause an emanation of thermal energy in the form of high-speed protons.

Question

Quizplus · Accepted Answer

Black holes cannot be observed directly because they emit no light, but they can be hunted for by observing the gravitational influence they have on nearby stars. The orbits of these stars can reveal the presence of a black hole.

Black Holes Cannot Be Observed Directly, Because They Emit No