In between doing awesome science experiments, astronaut crews in space keep an eye on the sky. And over the decades, they've captured some celestial visitors: comets! These collections of ice and dust shine brightly in several photos on a NASA Flickr page. It's an amazing reminder that our universe is a big place that's constantly changing.
What's a Comet?
What the Pictures Show
Written by Elizabeth Howell June 5, 2019
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