What Makes a Planet Habitable for Life


What Makes a Planet Habitable for Life

Planetary habitability is an indicator of the capability of earth or a natural satellite to expand and survive life-friendly environments.

Environments do not need to include life to be deemed habitable, nor are habitable areas the only areas in which life might occur.

It is interesting to think that life can only begin on a planet similar to Earth, however various kinds of planets could be able to support Earth-like features that may be necessary for habitability.

Our Galaxy may have millions of planets like Earth, or at least have similar features like water, air.

And in this post, we are trying to answer this question about What Makes a Planet Habitable for Life


What Makes a Planet Habitable for Life


Having the right temperature is very crucial for life or at least important for maintaining the right environment, low temperatures allow chemicals to react slowly, which interferes with life-saving reactions. Low temperatures often freeze water, leaving liquid water unavailable.

Having so much temperature will render life unsustainable, too. At around 125oC, protein and carbohydrate molecules and genetic material (e.g. DNA and RNA) begin to break up. Often, high temperatures evaporate water immediately.

Most earth-like life seems to be characterized as a temperature range of minus 15oC to 115oC. Liquid water can also remain in this range under specific conditions.



Water is one of the most significant things that can increase life or enable the earth and make life even more friendly and, as you know, the temperature can also contribute to the maintenance of liquid waters.

Whether water is available daily. Life will go inactive between rainy seasons, however, ultimately, water has to be present to support Earth-like life.

Too much water is not a concern, as long as it is not so lethal that it conflicts with the chemistry of life.


Small planets and moons do not have enough gravity to hold a habitable atmosphere. Gas molecules exit vacuum, leaving the earth or moon without a protective shell that will protect life from the heat or radiation of the stars.

Earth & Venus are just the right sizes to hold an adequate atmosphere to hold life, but Venus' atmosphere is 100 times denser than Earth's. It is composed almost entirely of greenhouse gases, making the surface too hot to support life.


The understanding of planetary habitability starts with the host star.

However, the issue of what makes a planet habitable is much more about making a planet situated at the right distance from its host star, so that water can be liquid on its surface, called the Goldilocks region.

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