![Monopoles Image source: YURI21century Monopoles Image source: YURI21century](http://www.timeone.ca/wp-content/uploads/2013/03/Monopoles.jpg)
Classification: concept
Chapter: The Missing Monopoles
Monopoles are hypothetical magnetic poles in space that have no opposite – north poles with no souths, for example. Their existence is key to fundamental physics but it seems that they are not observed. Or are they?