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. magnetic fields cause an emanation of thermal energy in the form of high-speed protons.
C. a black hole can still emit electrons.
D. black holes can gravitationally influence the orbits of nearby stars, and those stars can be observed.


Answer: D

Physics & Space Science

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