description Kepler-438b Overview
Kepler-438b is a near-Earth-sized exoplanet confirmed by NASA in 2015, orbiting within the habitable zone of a red dwarf star located approximately 472 light-years away. It has a radius only 12 percent larger than Earth's, making it one of the most Earth-like planets discovered in terms of physical size and stellar irradiation. However, subsequent observations of its host star revealed frequent and violent superflares. These intense radiation events, combined with a lack of atmospheric shielding, likely stripped the planet of its atmosphere and sterilized its surface.
help Kepler-438b FAQ
Is Kepler-438b actually Earth-like?
Its measured radius is close to Earth's, and it receives an amount of stellar energy that places it near its star's habitable zone. Those facts do not establish that it has oceans, an atmosphere, or an Earth-like surface.
Why might Kepler-438b be hostile despite being in the habitable zone?
Kepler-438 is an active red dwarf capable of producing powerful flares. Repeated radiation and particle storms could strip or severely damage the planet's atmosphere.
How was Kepler-438b discovered?
NASA's Kepler telescope detected repeated dips in the host star's light as the planet transited across it. The planet was announced among a group of validated Kepler worlds in 2015.
Can the James Webb Space Telescope inspect Kepler-438b's atmosphere?
The system is too distant and the host star too faint for the kind of detailed atmospheric study Webb performs on the most favorable small planets. Nearby systems such as TRAPPIST-1 offer more practical targets.
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