Dark matter is a theoretical form of matter that has no detectable radiation emission, hence the name. Its existence is inferred from gravitational effects, and it is predicted to account for approximately 22% of the total mass/energy content in the universe (normal matter accounts for only 4%).
Usage
See Special:Whatlinkshere/Etymology:Dark matter for a list of articles using this term.
This is an etymology page: a page detailing the origins of terminology used in the series in regards to real world culture and history.
