Planetwide mail

You're referring to a global postal service that can deliver mail to any planet in the solar system!

While we don't have a real-life "planetwide mail" service yet, there are some interesting concepts and proposals that have been discussed or experimented with:

1. Interplanetary Mail: In the 1960s, NASA proposed a concept for an interplanetary mail service, which would have allowed people to send letters to astronauts on the Moon or to other planets. However, the project was never implemented.
2. SpaceX's Starlink: Elon Musk's SpaceX is developing a satellite constellation called Starlink, which aims to provide global internet connectivity. While not specifically designed for mail delivery, Starlink could potentially be used to transmit digital messages or even physical packages between planets.
3. Lunar Mail: In 2019, a team of researchers proposed a concept for a lunar mail service, which would use a network of robotic spacecraft to deliver mail to the Moon. The idea is still in its infancy, but it could potentially be a stepping stone for interplanetary mail.
4. Planetary Postal Service: In 2020, a group of entrepreneurs launched a crowdfunding campaign to create a "Planetary Postal Service" that would allow people to send mail to other planets. The project is still in development, but it's an interesting concept that could potentially become a reality in the future.

While we're not yet at the point where we can send mail to other planets, these concepts and proposals show that there's a growing interest in exploring the possibilities of interplanetary communication and delivery. Who knows, maybe one day we'll have a planetwide mail service that can deliver letters to Mars, Jupiter, or even beyond!