![de Sitter Universe Image source: American Institute of Physics de Sitter Universe Image source: American Institute of Physics](http://www.timeone.ca/wp-content/uploads/2013/03/de-Sitter-Universe-e1403877188264.jpg)
Classification: publication
Chapter: The Problem of Whether Space is Something
In 1917 Dutch mathematician and cosmologist Willem de Sitter published a solution of the general relativity equations for a simplified universe that contains no matter.