Cosmic Scale
TRAPPIST-1e
Rocky exoplanet · 40 light-years
How big is TRAPPIST-1e?
TRAPPIST-1e is about 11,720 km across.
See TRAPPIST-1e in 3D, at true scale
TRAPPIST-1e is one of seven Earth-sized planets orbiting a small red dwarf 40 light-years away. It is slightly smaller than Earth, rocky, and orbits where liquid water could exist on its surface. Its look here is an artist's impression.
At a glance
| Diameter | 11,720 km |
|---|---|
| Mass | 4.12 × 10²⁴ kg |
| Diameter compared with Earth | 0.920 × Earth |
| Size | 0.92× Earth |
| Year | 6.1 days |
| Star | TRAPPIST-1, a red dwarf |
Good to know
- It is probably locked with one side always facing its star: endless day on one half, endless night on the other.
- The James Webb Space Telescope is searching it for an atmosphere.
- All seven TRAPPIST-1 planets orbit closer to their star than Mercury does to the Sun.