According to Kepler results in mid- 2013, what fraction of stars host an Earth- size planet?
A)about 15%
B)about 100%
C)about 70%
D)about 20%

Question

Quizplus · Accepted Answer

This was the fraction of stars that Kepler had observed to have an Earth-size planet in the habitable zone as of mid-2013. However, later studies using data from Kepler and other telescopes suggest that the actual fraction of stars with Earth-like planets could be much higher, possibly as high as 40%.

According to Kepler Results in Mid- 2013, What Fraction of Stars