The Goldilocks Zone

Guest Writer, Bronwyn Pearse

When Goldilocks tasted baby bear’s porridge for the first time two words leapt off the page. “Just right.” She added, ‘Not too hot and not too cold.

The important in factor in Goldilocks decision to eat the porridge was the temperature of the food. 

The true definition of a Goldilocks planet is that it has liquid water on it. While this is an important feature it’s not the only feature necessary for survival.

When talking about a region where some kind of life could possibly exist or be, truly ’just right’, Astronomers and Astrobiologists refer to this as a ‘circumstellar habitable zone.’ Multiple factors impact the sustainability of life on planet earth. 

Earth has indeed been described as the ‘Goldilocks’ planet.

As it resides in /near

The Just Right Galaxy Cluster

The just Right Galaxy

The Just Right Star (sun)

The just Right orbit (earth-sun)

The just-right moon

The just-right planetary companions.


Furthermore, the earth simultaneously possesses eight other habitable zones.

1. The liquid water habitable zone

2. The ultraviolet habitable zone

3. The photosynthetic habitable zone

4. The ozone habitable zone

5. The rotation rate habitable zone

6. The obliquity (tilt) habitable zone

7. The tidal habitable zone

8. Atmosphere habitable zone.

These multiple zones must come together simultaneously and for an extended period to make life possible.

Overreaching all of this is the point that as the complexity of life goes up so does the window of necessity become narrower.


In considering this and other such evidence, astrophysicist Freeman Dyson in his book, ’Disturbing the Universe’ wrote:” The more I examine the universe the more evidence I find that the universe in some sense knew we were coming.”

If you have ever bought a ticket in a lottery you would appreciate how statistically difficult it is to ‘hit the jackpot.’ Chance and time dance an elusive two-step.

A friend told me recently while discussing this ultimate challenge that “life would simply find a way. That’s what life does.”

My response to this argument is if that’s the case, where is the evidence in this planet filled universe, of other life? I won’t even ask for advanced life just single-cell organisms existing on another planet.

Well, the scientific community appreciates this fact and they have been on the hunt. Of the 3600 plus, planets discovered thus far none (except the one we are living on) have met the above requirements.

In fact, the above features have come about partly as a result of these investigations. So let’s look at these features more closely.

Check out my next blog ’With ice or Without’ Go to the square icon above to navigate the pages

See https:/ ( an article on habitable zones)


Also: Dr Hugh Ross ‘Improbable Planet, & The Creator and the Cosmos, Dr Paul Davies ‘The Cosmic Blueprint’, Dr Steven Hawking ’ A Brief History Of Time’. Freeman Dyson ’Disturbing the Universe’

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