Do we live in a giant void? It could solve the puzzle of the universe's expansion 

 One of the biggest mysteries in cosmology is the rate at which the universe is expanding. One possible explanation: That we live in a giant void in space (an area with below average density). 

https://cdn.mos.cms.futurecdn.net/hgFgYw6hMMweZWaGrAJ2j5.jpg

https://www.space.com/do-we-live-in-a-void-could-solve-universe-expansion