The exoplanet Kepler-78b is just 20 percent wider and about 80 percent more massive than Earth, with a density nearly identical to that of Earth, two research teams report in separate papers published online today in the journal Nature.
The exoplanet Kepler-78b is just 20 percent wider and about 80 percent more massive than Earth, with a density nearly identical to that of Earth, two research teams report in separate papers published online today in the journal Nature.