Finding the Universe's Missing Matter

After decades of coming up short, scientists have finally discovered what was hiding in plain sight.

When Colin Hill found himself bored on winter break from Princeton University in late 2013, he decided to search through old cosmology papers. (Grad students are fun like that.) He saw one that sparked an idea: Now that telescopes are so sensitive, could we learn anything new about missing matter by comparing the latest maps of galaxies with traditional records of the universe’s oldest light? Over the next few days, Hill worked through a quick analysis. It looked like he might be on to ...

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