Entering orbit…
| Yours | GJ 229 b | |
|---|---|---|
| Mass | 17.0 × Earth | 14.9 × Earth |
| Radius | 4.16 × Earth | 3.97 × Earth |
| Density (composition) | 1.30 g/cm³ | 1.31 g/cm³ |
| Temperature | 152.3 K | 112.0 K |
| Starlight received | 0.05 × Earth | 0.02 × Earth |
| Star temperature | 5,600 K | 3,564 K |
Inside the synchronous orbit: it spiraled inward and was torn apart at the Roche limit (Phobos's fate).
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
Tidal heat sustains a subsurface ocean over a rock seafloor: a strong candidate for life (Europa-like, 96/100).
Small and distant: a quiet, stable companion.
Small and distant: a quiet, stable companion.
Small and distant: a quiet, stable companion.
Small and distant: a quiet, stable companion.
Too warm for nitrogen and methane frost and too small to hold them as an atmosphere: those ices escaped to space, leaving water ice.
Small and distant: a quiet, stable companion.