Approximately how many Earthlike planets with orbits closer than Mercury's are believed to exist in our Galaxy?
A) no more than 1 such planet per 10 stars
B) at least 1 such planet per 6 stars
C) at least 1 such planet per 2 stars
D) at least 2 such planets per star

Question

Quizplus · Accepted Answer

Recent astronomical studies and observations suggest that Earthlike planets in close orbits around their stars are more common than previously thought. The estimate of at least 1 such planet per 6 stars is based on extrapolations from observed exoplanets and theoretical models of planet formation.

Approximately How Many Earthlike Planets with Orbits Closer Than Mercury's