There is found two probably habitable planet's near our solar system.

The research team, which operates in the Canary Islands found two earth-mass planets near our solar system. Those planets are orbiting red dwarf GJ or Gliese 1002 in the habitable zone. And that thing is one of the most remarkable things in astronomy. The distance to that star is 15,8 light years. So that star is almost our neighbor. 

The surface temperature of that "M" spectral class star is about  3,024 K or 2,751 °C. That means it's far colder than the sun. Even if those planets are close to their star, the radiation of that star is weaker than the Sun. 

The habitable planets near red dwarfs are possible. If there is lots of water on the planet clouds are cooling their atmosphere. Same way as the night side of the locked planet is very cold. And monsoon winds that formed because of the differences in temperatures are also decreasing the temperature on the planet. 

Super-Earths and habitable zones. 

The term "super-earth" means a rocky planet that is larger than Earth. But the planet's size doesn't mean its gravitation is stronger than Earth's gravitational field. The elements that are forming planets determine the strength of the gravitation. And there are known exoplanets that size is two times Earth, but their gravitation is just over 0,6 times Earth's. So the planet is lighter than Earth. 

There must also be smaller-than Earth, metal-rich planets than Earth. But their gravitational fields are stronger. If a small planet involves lots of heavy metals, its gravitational field can be stronger than Earth's. 

Also, if the sea covers the entire planet, that can cause a situation. That winds travel around the planet. That thing can cause that friction turns the atmosphere's temperature very high. In the case of water planets, the wind can continue even for millions of years. And in that case, the long-term friction. Even if that is weak can have massive consequences. 

In a strong gravitational field, gravitation turns water to ice. Also, even a thin atmosphere is turning very dense. 

Because gravitation pulls gasses to the planet's surface in an extremely strong gravitational field, and in extreme pressure, even gasses are turning solid. That kind of planet where the atmosphere is in solid form cannot host any lifeforms. But in gravitational ice could theoretically live 2D worms. 

There is planet Gliese- or GJ 436 that hot ice is covering. The gravitation of that planet is so strong, that water cannot vaporize. 

But normally, or in most scenarios. Liquid water and a stable atmosphere are a requirement for lifeforms. And the planet must somehow tie gasses around it. So the planet must have a magnetic field that pushes star wind away from its atmosphere. Or those ionized particles will blow the atmosphere away from the planet. 

If the planet's gravitational field is weak, the atmosphere will turn very huge. But for a stable atmosphere planet must also have a magnetic field. That denies star wind blowing the gas away from the planet. And that means the planet must have a nucleus in liquid form. 

If the planet's gravitational field is strong, it causes the water's boiling temperature is turning higher. And if the planet's gravitational field is weak, it decreases the boiling point. So if the planet's gravitational field is weak, the water turns to vapor or its density decreases. That means water in very weak gravitation is not in the same form as it's on Earth. 

https://scitechdaily.com/two-potentially-habitable-earth-like-planets-discovered-around-a-star-near-the-sun/

https://en.wikipedia.org/wiki/Gliese_436_b

https://en.wikipedia.org/wiki/Gliese_1002

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