Earth Similarity Index

-ESI (Earth similarity index) is a scale for a planet if it is similar to Earth, it ranges from 0 to 1. 1.00 is earth and 0.00 is a planet that is the opposite of earth. Having a high ESI means it is probably habitable, but sometimes a planet is even better for life than Earth so it isn't similar to Earth, so this is not accurate to measure how habitable the planet is.