The presence of dark matter on Earth is a topic of scientific investigation and debate. Dark matter does not interact with electromagnetic radiation, which makes it extremely difficult to detect directly. The evidence for the existence of dark matter comes from its gravitational effects on visible matter and the large-scale structure of the universe.
While dark matter is thought to make up about 27% of the total mass-energy content of the universe, the estimate that it constitutes 95% of all matter refers specifically to the matter component of the universe (excluding dark energy). So, 95% of the matter in the universe is believed to be dark matter.
Regarding its presence on Earth, several experiments have been conducted to detect dark matter particles directly, but so far, no conclusive evidence has been found. This implies that if dark matter is present on Earth, it is likely in a form or state that is challenging to detect with current technologies.
Various theoretical models propose different possibilities for the nature of dark matter particles. Some theories suggest that dark matter particles may interact very weakly with ordinary matter, making their detection extremely difficult. Others propose that dark matter particles might be produced in high-energy collisions, such as those occurring in particle accelerators, but these hypotheses require further experimental confirmation.
The presence or absence of dark matter on Earth has significant implications for our understanding of the universe. If dark matter particles were detected on Earth, it would provide valuable information about their properties and potentially shed light on the fundamental nature of physics. On the other hand, if dark matter is not found on Earth, it would challenge certain models and theories, requiring scientists to explore alternative explanations for the observed gravitational effects attributed to dark matter.
In summary, the question of whether dark matter is present on Earth remains an open and active area of research. Scientists are continuously working on improving detection techniques and conducting experiments in the hope of unraveling the mysteries surrounding dark matter.