Some of the universe's most extreme explosions leave behind almost no trace. The original explosion is unseen, but our observations can capture the long-lived echo it leaves behind as the shock front ...

Everything humanity has ever touched, measured, or imagined as “normal” matter is a tiny sliver of reality. Less than 5 percent of the known cosmos is made of the atoms that build stars, smartphones, ...

What is once seen can never be unseen. That is the sage advice and warning a departing war correspondent gives to Mia, the young photographer taking her place. In “Unseen,” now playing at Capital ...