According to this page: https://www.clubforfuture.org/postcards your digital or physical postcard can be sent into space. We created a few as there is no limit and when they return from their flight we will share with you the emailed results.
Barron's Postcard:
Our surprise one for Dad so he is part of this experience:
Mom's Design:
Mom's message of appreciation for everyone who helps with our health and fitness:
These are the instructions and details:
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They returned from space:
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