It's the first one! To celebrate, here are some of my favorite astronaut Instagram pics.
  1. From @astro_christina
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  2. @astro_kjell
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  3. @astro_terry with #astrosamantha and #antonastrey
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  4. @astro_tim
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  5. @astro_timpeake
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  6. @stationcdrkelly
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    Giving himself a flu shot in space.
  7. @shuttlecdrkelly (twin brother of 👆)
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  8. A flower grown on the ISS
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  9. @colchrishadfield
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  10. Sunita Williams
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    Via @astrokelly
  11. Karen Nyberg
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    Via @brandstmuseum