description Kepler-444 d Overview
Kepler-444 d is a confirmed sub-Earth exoplanet orbiting the K-type star Kepler-444. It belongs to a compact system whose five known planets complete their orbits close to the host star, and whose age is estimated at roughly 11 billion years. Kepler-444 d is of interest in exoplanet research because it shows that small, likely rocky planets existed around stars formed early in the Milky Way’s history.
help Kepler-444 d FAQ
What is unusual about Kepler-444 d?
Kepler-444 d is a confirmed sub-Earth planet in a compact five-planet system. The system is estimated to be roughly 11 billion years old, making it much older than the Solar System.
How many planets orbit Kepler-444?
Five known planets orbit the K-type star Kepler-444. Their orbits are all close to the host star, producing a tightly packed system.
Is Kepler-444 d larger than Earth?
No, it is classified as a sub-Earth, meaning it is smaller than our planet. Its small size makes it an example of the tiny worlds that transit surveys can detect around old stars.
How was Kepler-444 d found?
It was identified through the transit method, which detects repeated dips in the star's brightness. The Kepler spacecraft's long monitoring campaign made it possible to distinguish the five closely spaced planetary signals.
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