WASHINGTON: Water in liquid form is thought to be a necessity for life on Earth.
Naturally, some say that life may flourish under other conditions, and perhaps even in the absence of water.
While that may be true, take a look around – life seems to do quite well here on Earth and we’ve yet to find it elsewhere in our Solar System.
Based on this, let’s look at the classical definition for the habitable zone as the region around a star, such as our own Sun, where the temperature of any orbiting planet permits water in liquid form.
Astrophysicists are extremely good at calculating the temperature of a star and then, taking into account the distance of a planet from its host star, it is easy to work out the planet’s “equilibrium temperature”.
The starlight (in our case, sunlight) that falls onto the planet is reradiated as heat and, hey presto, we have our actual planet temperature – simple. Except it isn’t.
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