What are the cosmic voids made of?

Now that we have tools to find vast numbers of voids in the universe, we can finally ask…well, if we crack 'em open, what do ...
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Hubble Telescope's Stunning View Of The 'Pillars Of Creation' Explained

NASA Goddard Space Flight Center's Dr. Jennifer Wiseman explains the Hubble Space Telescope's view of the Pillars of Creation ...