I Have a Friend on Jupiter by Celine Rose Mariotti
Carlos and Indiana find a website that promises to find them pen-pals from outer space. Imagine their surprise when they connect with Manny and Kossie, two alien children on Jupiter! They are amazed to learn about Jupiter, where the people are blue, everyone is a vegetarian, and the trees grow 300 feet tall.
The kids from Jupiter are as amazed to learn about American kids as well. There are no horses to ride on Jupiter. Soon the excited youngsters plan for Manny and Kossie to visit them on their ranch so they can learn about horses first hand. The intergalactic visit is an exciting idea and to their surprise, is not impossible at all. Indiana and Carlos are delighted to learn their space pals will be allowed to visit quite soon.
What their reception will be from other Earthlings, though, is another question.