Being in the habitable zone is not sufficient for a planet to continuously keep liquid water on its surface.
"Earthlike exoplanets" are a favorite subject of science and popular media reporting.
It could be that for an Earth-like planet to form, the metallicity of its solar and galactic neighborhood needs to be close to that of our early solar system.
Along with those we’ve already discussed in this series, further parameters must be added to the list of conditions for a life-supporting planet.
For a planet to be habitable, its star must also meet certain standards.