The article describes how to create a Flask app with Python that uses Contentful's content delivery API and Twilio's Programmable SMS API to support space travel. The app will provide instructions, maps, and fan messages to astronauts on their way to Mars. The app uses localization to display instructions in the astronauts' native languages. The article covers how to create a Flask app with four routes: one for general information, one for exosphere instructions, one for spacemap, and one for sending fan messages via SMS. It also explains how to use Contentful's Image API to reduce image payload size and Twilio's Programmable SMS API to send text messages.