Habitable zone for complex life

With multiple zonal constraints, the zones would need to overlap for the planet to support complex life.

[8] Many exoplanets are super-Earths, that could be a gas dwarf or large rocky planet, like Kepler-442b at a mass 2.36 times Earths.

Thus life habitable zones require and very stable star like the Sun, at ±0.1% solar luminosity change.

[12] Star metallicity, mass, age, color, and temperature all effect luminosity variations.

[18] Multiple-star systems are also very common and are not suitable for complex life, as the planet orbit would be unstable due to multiple gravitational forces and solar radiation.

Over time and with more research, astronomers, cosmologists and astrobiologist have discovered more parameters needed for life.

Carbon's ability to bond to oxygen, hydrogen, nitrogen, phosphorus, and sulfur (called CHNOPS) is key to life.

Natural shielding against space weather and solar wind , such as the magnetosphere depicted in this artistic rendition, is required for planets to sustain life for prolonged periods.