Dark matter is made of tiny black holes
Stephen Hawking in 1974 predicted that dark matter goes back to the big bang and is made of black holes. Since then, scientists have been investigating this theory.
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The Argument
Scientists postulated that dark matter can be made of big or tiny black holes. Research has discovered massive black holes millions to billions times the size of the sun. These black holes are the easiest to detect because of their large size. Theoretically, there are many smaller black holes that formed after the big bang but are undetectable due to their small size. Scientists predicted that dark matter can be made of the massive black holes, the tiny black holes, or a combination of the two. [1]
The data on massive black holes did not support the hypothesis that dark matter can be made of big black holes because of their scarcity. Tiny black holes are still candidates of what constitute dark matter. Dark matter is made of tiny black holes and research on dark matter should focus on discovering them.[2]
Counter arguments
Most modern scientists disprove the theory of black holes as a component of dark matter. Scientists conducted experiments involving the detection of gravitational lensing: the phenomenon of light bending as an object like a black hole moves past another due to gravity. Gravitational lensing results in an increase in brightness of nearby stars which researchers can detect. If an increase in brightness of nearby stars is detected, then a black hole has passed. Scientists predicted to see 1000 brightening events if dark matter is made of black holes. Scientists detected only one event. The results showed that black holes can contribute no more than 0.1% of dark matter. It is highly unlikely that black holes make up dark matter. [3]