Dear Earthling,
The ice has melted... and formed a rather slippery dance floor. Bring your best moonwalk.
Wishing you low gravity and high spirits,
The Jovian Society of Party Planners
Dear Terran,
It's hot here, really hot. Think sauna but without the comforting presence of space-age therapy music.
Wish you were here (but not too close),
Vera from Venus
Dear Earthstar,
We've found the biggest dust pile; it's like a desert here, but with fewer WiFi options and more rocks.
Stay grounded yet floaty,
Curiosity Rover (with a ghostwriter)