How many earth-like planets are thought to exist in the universe?
Extrapolation from current estimates suggests upwards of
Current estimates based on data from the Kepler mission suggest that there are somewhere between 1 and 50 billion "Earth-like" planets in the Milky way alone, depending on how one defines "Earth-like".
Let's take the low end of that estimate (
If there are more than 100 billion (
The total number then is
That's probably more than the number of grains of sand on every beach on Earth. In other words, a LOT .