MARSFEVER POSTAL AUTHORITY · EST. SOL 001
Mail from Mars.
The only post office on two planets. A rover pen pal who writes real letters to your kid — and a homeowners association on Mars that will correspond with your friend forever, whether they like it or not.
Two kinds of mail
Every letter is written, stamped,
and sent from the red planet.*
*Emotionally. Physically, our mail room is on Earth — the postage from Mars was outrageous. Every letter is a real, lovingly-written email that arrives in your inbox looking like it survived the trip.
Letters from Mars
Rusty the Rover writes to your kid by name — dust devils, blue sunsets, the rock that lived in his wheel for a month. Real Mars science smuggled inside a very funny robot. Sent to a grown-up's inbox.
→ Start the correspondence, free FOR FRIENDS · $1/MONTHThe Mars HOA
Gift a friend a plot in Olympus Mons Estates. They get a deed, then the letters begin: violation notices, dues statements, ballots where both candidates are named Greg. It does not stop until you stop paying the $1.
→ Enroll a victim— residentExhibits
Evidence of correspondence
Actual letters from both desks of the Postal Authority.
Re: Untidy regolith — Unit 114, Cydonia Court
Dear Resident, during a routine drive-by (the rover drives by everything), the Architectural Committee observed that your regolith is untidy. Dust has been observed settling on the property in a manner inconsistent with community standards.
Required action: none possible. The dust is planetary. Deadline: 30 sols. Fine for non-compliance: a sterner letter.
Hello Maya! I'm Rusty. I live on Mars.
I'm a rover — a robot the size of a go-kart, with six wheels, one arm, and seventeen cameras. You should know the sunsets here are blue. Your planet got that backwards.
Mission log: today I drove 40 meters, which is a rover marathon. I found a rock shaped like a slightly rounder rock. Classified it TOP SECRET. You're welcome, Maya.
Free instruments
Tools of the Authority
Free calculators and field guides. No signup required — this is a public service of the postal system.
Your age on Mars
A Mars year is 687 Earth days — so you have a second, rarer birthday. Find your Martian age and when your next Mars birthday lands.
→ Calculate CALCULATORYour weight on Mars
Gravity on Mars is 38% of Earth's. See what the scale would say — and why your mass never changed.
→ Calculate FIELD GUIDEHow long is a day on Mars?
24 hours, 39 minutes, 35 seconds — the sol, and why NASA rover drivers used to live on Mars time until it broke them.
→ Read FIELD GUIDEMars facts for kids
Blue sunsets, dry-ice snow, a volcano three Everests tall — the good stuff, no homework attached.
→ ReadThe Dispatch
Occasional mail about mail from Mars
New letter series, new tools, new ways to bother your friends interplanetarily. Rare and short.