Impossibly Large "Holes" in Space Present Us With a Cosmic Quandary

Cosmological mysteries need not revolve around impossibly strange objects like black holes or neutron stars. The best mysteries may not even need to affect our everyday lives, or leave gaping holes in our scientific models (*ahem* dark energy). Sometimes, the mysteries can merely be the absence of something unexpected. Personally, the one that gets me every time falls in the latter camp: voids - large "holes" in space that are generally absent of *everything* observable (some contain very few galaxies instead of being completely devoid of everything). For the most part, these voids don't have stars, galaxies, planets, clusters, stellar material, or any other visible constituent parts. Our own galaxy, which is a member the local group of galaxies, actually lies at the edge of one of these voids, dubbed the "local void." (One of the most famous is called the bootes void.)

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