The Astronomer's Post

Jourdyn writes The Astronomer's Post as letters from a traveler roaming the solar system, with a recent edition set on Uranus. Every envelope includes a handwritten letter from the traveler, a gazette printed on linen paper and a 4x4 photo print. The Wanderer plan adds stickers, a 5x7 art print and a surprise item, and Wanderer+ adds a handmade envelope, a rigid mailer and extra ephemera like bookmarks and maps.

Plans cost $8.99, $13.99 or $16.99 a month. Letters leave on the second Monday of each month with regular stamps and no tracking, and orders placed now start with the October edition.

For space fans and anyone who likes learning through story.