The Biggest Thing Ever

Have you ever felt like the universe is very, very large and you’re just a tiny, insignificant dust speck floating on the third rock from the sun? Who hasn’t, right? Well, hold on to your dandelion because this news is going to make you feel like the microscopic Who that Horton heard.

Recently, astronomers discovered the largest known structure ever seen in the universe — a clump of active galactic cores that stretches 4 billion light-years from end to end. This enormous structure is something...