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Charting the system…

TRAPPIST-1

a real M-star system, 40 light-years away7 planets← All exoplanets
Host star

TRAPPIST-1

Type
M-type (Red Dwarf)
Spectral type
M8.0 V
Temperature
2,566 K
Radius
0.119 ☉
Mass
0.0898 ☉
Known planets
7
Luminosity
5.53e-4 ☉

Published by the NASA Exoplanet Archive. These planets’ temperatures and habitability scores are computed from this star’s measured luminosity, not from a stand-in for its class.

TRAPPIST-1 b — 0.01 AUTRAPPIST-1 c — 0.02 AUTRAPPIST-1 d — 0.02 AUTRAPPIST-1 e — 0.03 AUTRAPPIST-1 f — 0.04 AUTRAPPIST-1 g — 0.05 AUTRAPPIST-1 h — 0.06 AUTRAPPIST-1 bTRAPPIST-1 cTRAPPIST-1 dTRAPPIST-1 eTRAPPIST-1 fTRAPPIST-1 gTRAPPIST-1 h
TRAPPIST-1 b
TRAPPIST-1 bRocky TerrestrialHabitability 35 · Extremely Harsh0.01 AU · 1.37 M⊕
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TRAPPIST-1 c
TRAPPIST-1 cEarth LikeHabitability 76 · Habitable0.02 AU · 1.31 M⊕
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TRAPPIST-1 d
TRAPPIST-1 dRocky TerrestrialHabitability 43 · Marginal0.02 AU · 0.388 M⊕
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TRAPPIST-1 e
TRAPPIST-1 eRocky TerrestrialHabitability 43 · Marginal0.03 AU · 0.692 M⊕
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TRAPPIST-1 f
TRAPPIST-1 fIce WorldHabitability 25 · Extremely Harsh0.04 AU · 1.04 M⊕
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TRAPPIST-1 g
TRAPPIST-1 gIce WorldHabitability 29 · Extremely Harsh0.05 AU · 1.32 M⊕
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TRAPPIST-1 h
TRAPPIST-1 hIce WorldHabitability 10 · Uninhabitable0.06 AU · 0.326 M⊕
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A binary star system's orrery: two suns close together, a red dashed dead-zone boundary, and a debris trail left by a destroyed world

New: Binary Star Systems 🌀

A system can now orbit two suns. Add a companion star when you build one — close, medium, or wide — and the physics decides what survives: a shared center of mass carves out a dead zone where gravity from both stars tears a world apart, leaving it as debris, and every surviving planet's orbit goes elliptical, moving fastest at closest approach and slowest out at aphelion. Push the separation to wide and the dead zone opens tens of AU across, wide enough to gut a system that would have been stable around one star alone. Stand on a world that made it through and you'll watch two suns cross the sky together.

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