The solar system of Ahu contains six planets. The first three planets are rocky. Toa is the second of these. The outer three are gas giants. Most are visible from Toa to the naked eye. Working outwards, they are:
1. Haoni
Type of planet: Rocky
Size (in Earths): 0.6
Moons: 0
Orbit: 185 days
Visibility: Naked eye
Appearance: Yellow-white
2. Toa
Type of planet: Rocky
Size (in Earths): 0.95
Moons: 1
Orbit: 352.7 days (356.33 local days)
Visibility (from Surũã): Naked eye
Appearance (from Surũã): Blue-white
3. Surũã
Type of planet: Rocky
Size (in Earths): 1.2
Moons: 2
Orbit: 6 Earth years
Visibility: Naked eye
Appearance: Gold
4. Pelã
Type of planet: Gas giant
Size (in Earths): 566
Moons: 5
Orbit: 22 Earth years
Visibility: Naked eye
Appearance: Dark orange with two rings
5. Sukari
Type of planet: Gas giant
Size (in Earths): 908
Moons: 9
Orbit: 57 Earth years
Visibility: Telescope only
Appearance: Pale green
6. Uto
Type of planet: Gas giant
Size (in Earths): 421
Moons: 6
Orbit: 92 Earth years
Visibility: Telescope only
Appearance: Blue
The names of the visible planets (the first four) vary considerably between languages, but they tend to be named after deities. The outer two planets are named after their discoverers. These names are more consistent cross-linguistically. All names are given here in their Letoa form.
For ease of communication, the international scientific community sometimes refer to the planets by a solar system number. In this scheme, Haoni is Ahu 1, Toa is Ahu 2, and so on.
Toa’s moon is known in Letoa as Sũba. It is 0.012 times the size of Toa and orbits its host planet in 25.5 days. Its name also varies between different languages.
The solar system also contains numerous other smaller objects such as sednoids, comets, asteroids and dwarf planets.
Like the humans of Earth, the Rotoa have ventured into space. They are a little ahead of us in this regard. They have set foot on both Haoni and Surũã, returning several times to both planets. They have established a permanent research base on Sũba.