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Black holes cannot be observed directly, because they emit no light. However, a scientist can hunt for black holes because
Electromagnetic Radiation
Rays produced by the collision of a beam of electrons with a metal target in an X-ray tube.
Uptake Study
An Uptake Study is a medical test used to assess the functioning of specific organs by measuring the absorption of a radioactive substance.
Radioactive Substance
A material that emits radiation, resulting from the decay of atomic nuclei, used in various medical, industrial, and research applications.
Organ
A part of the body constructed of many types of tissue to perform a function.
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