This puzzle of a NASA JPL Visions of the Future Poster advertises the alignment of all outer planets that occurs only once every 175 years. NASA's Voyager mission used gravity from each of the planets to propel it to the next. What would it be like if you could ride one of these shuttles as a tourist?
NASA Space Travel Poster on a Mug 15oz. Porcelain Jumbo Mug Dishwasher and microwave safe Size: 5"x4.25"