The Boötes Void is giant super void spanning 250 million light years across with almost nothing in it. Its existence has challenged astronomers for decades.

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LINKS LINKS LINKS:

Isaac Arthur’s YouTube channel:

https://www.youtube.com/channel/UCZFi…

http://io9.gizmodo.com/5923493/behold…

Photo credits:

Kansastravel.org

albawaba.com

astrobob historicmysteries.com

Foam: foams@aber

Video credits Daniel Cortese – alien invasion montage https://www.youtube.com/watch?v=Rp2tW…