What does it mean?
Kelvin – is the standard unit that scientists use to measure temperature. The temperature at which water freezes on the surface of Earth is 273 Kelvin, and the temperature that water boils is 373 Kelvins.
Habitable zone – The region of space in a solar system that scientists believe would be suitable for life.
In human speak please!
Goldilocks Zone – The Habitable Zone is also called the “life zone,” “green belt,” or “Goldilocks zone.” It is the distance of a planet from a star at which the temperature of the planet allows for liquid water. This is the temperature range that scientists think would sustain life. Too far away from the star, and any water on the planet will be frozen; too close and it boil off. This distance depends on the size and heat energy output of the star around which the planets orbit.