Solar System Memo (or Memo showing solar system) is a file found at the Uranium Refinery in Galerians: Ash.
It shows several planets of the solar system with their names: Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. In the first and second pages, planets are named with their English names and orbits are colored blue. In the third page, the orbits are colored red and the names are in Latin, but the names are also incomplete. The Latin names for Earth and Saturn are Tellus and Saturnus respectively.
The names of the planets are needed to re-write the blank card key that is necessary to unlock the golden doors decorated with planets.