An artist's rendering of a black hole that's 2 billion times more massive than our sun. Streams of particles ejected from black holes like this one are thought to be the brightest objects in the universe.
Fireworks explode over the National Mall during the 2015 July 4 fireworks show in Washington, D.C. For its 2016 Independence Day show, PBS used stock footage from previous shows, due to bad weather in the capital.
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A man carries empty fireworks shells past a collapsed building after a massive fire broke out during a fireworks display at a temple complex in Paravoor village in the state of Kerala, India.
At least 28 people were injured Thursday in Simi Valley, Calif., when many of the fireworks at a July 4th celebration ignited too close to the ground. People there caught the accident and posted videos.