![](https://www.nasa.gov/sites/default/files/thumbnails/image/39185734754_303823b519_o_1.jpg)
On the last Thursday in January, NASA pays tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues who lost their lives while furthering the cause of exploration and discovery. via NASA http://www.nasa.gov/image-feature/day-of-remembrance-2018
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