On January 28, 1986, Space Shuttle Challenger was lost 73 seconds into its 10th flight, leading to the deaths of its seven crew members. | NBC News

The Challenger space shuttle tragedy shocked the entire world and reminded everyone of the gravity and intense dangers space exploration really is. Decades later, visiting space as a tourist is now closer than ever, but we must never forget those brave astronauts who risked everything to adventure into the great unknown. Today's epic new video revisits that tragic day and analyzes what caused the Challenger to experience a catastrophic failure. | The Infographics Show