How Many Planets in One Galaxy?

At least one out of every 6 stars has an Earth-sized (or larger) planet, NASA said last month.

One out of every six. Remember, Carl Sagan used to say “billions and billions and billions” of stars exist in the universe.

How many planets might exist in the Milky Way galaxy, then?

Here’s the gist: Estimates of the Milky Way’s star population = 100 billion. If the NASA estimate holds, then there are — wait for it — SEVENTEEN BILLION PLANETS that are roughly the size of Earth.

In just the one galaxy . . .

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