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earth sized planets circular orbits
The system Kepler-444 formed when the Milky Way galaxy was a youthful two billion years old. The planets were detected from the dimming that occurs when they transit the disc of their parent star, as shown in this artist's conception.
Exoplanets With Circular Orbits Like Earth Could Host Alien Life

ByAna Verayo | Jun 02, 2015 06:44 AM EDT

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