Theory suggests that miniature black holes might have formed in the early universe. But astronomers do not have any evidence of their existence. Miniature black holes have event horizons as small as the width of an atomic particle and might have been created during the Big Bang, the moment the universe was created. These miniature black holes contain as much matter as Mt. Everest (a lightweight compared to nine times the mass of the Sun!).
Miniature black holes might have formed during the dawn of our universe. Between 10 and 20 billion years ago, all matter and energy was compressed into a single point. Then this tiny point exploded (the Big Bang) and expanded rapidly. Some parts might have expanded more rapidly than other parts, compressing some matter and squeezing it into miniature black holes.