GJ 667 Cc is one of the most famous and intriguing “Super-Earths” because it exists in a triple-star system, located about 23.6 light-years away in the constellation Scorpius.

Key Physical Characteristics

• Planet Type: Terrestrial (rocky) Super-Earth.
• Mass: It is at least 3.8 times the mass of Earth.
• Orbit: It completes a “year” in just 28 Earth days.
• The Star: It orbits Gliese 667 C, a red dwarf that is part of a three-star dance. The other two stars in the system (Gliese 667 A and B) are orange dwarfs. 

Habitability & Environment

In Lisa Kaltenegger’s research, this planet is a classic example of a world that could support liquid water:

• Energy Intake: It receives about 90% of the light that Earth gets from the Sun. However, most of this light is in the infrared spectrum, which is very efficient at heating a planet.
• The View: If you stood on the surface, you would see one large red sun (GJ 667 C) and two very bright distant “stars” (A and B) that would provide as much light as a full moon even during the “night.”
• Temperature: If it has an Earth-like atmosphere, the average temperature could be around 13 °C (55 °F), which is very similar to Earth’s average.

Scientific Significance

• The “Triple Threat”: This planet proved that stable, habitable worlds can exist even in complex multi-star systems.
• Atmospheric Potential: Because it receives a similar amount of energy to Earth, it is a primary candidate for searching for water vapor and clouds.
• Tidal Locking: Like its neighbors, it is likely tidally locked, meaning one side is a permanent desert or ocean under the sun, while the other is a frozen wasteland.

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Published @ March 24, 2026 9:17 am