I don't know that exact ratio, but the number of stars that you can see that probably have planets in their "habitable zone" is pretty high... One in 5. https:

I don't know that exact ratio, but the number of stars that you can see that probably have planets in their "habitable zone" is pretty high... One in 5. https://www.popsci.com/article/science/one-five-sun-stars-have-earth-planets/ https://www.popsci.com/article/science/one-five-sun-stars-ha... In our solar system, 2-3 of the 8-9 planets are in the "habitable zone". So let's just say it's maybe one in 20 or so.