needs to life on Earth, then you definitely’ll want liquid water.
At this sweet spot, liquid water might exist on the exoplanet’s surface. Observatories such as NASA’s Kepler area telescope use this “transit technique” to nice effect, constantly detecting new worlds. As an exoplanet passes in front of its star as viewed from Earth, a really slight dip in starlight brightness is detected.
That’s the way it is going to be till we build an unlimited telescope that may straight