Of the planetary systems that may exist in our galaxy, what fraction may contain a habitableplanet?
A)almost all
B)about half
C)about a tenth
D)only 1 in 50
E)less than 1 in 100

Name: Of the planetary systems that may exist in our galaxy, what fraction may contain a habitableplanet? A)almost all B)about half C)about a tenth D)only 1 in 50 E)less than 1 in 100
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Quizplus · Accepted Answer

The Drake equation estimates that there are about 100 billion stars in our galaxy, and that about 10% of them may have habitable planets.

Of the Planetary Systems That May Exist in Our Galaxy