Topic: Goldilocks Planet

Goldilocks Planet

Just like the porridge in “Goldilocks and the Three Bears,” Goldilocks planets aren’t too hot or too cold, but just right. A Goldilocks planet is a planet that is within a star’s habitable zone, where it is possible for liquid water to exist; because our current scientific understanding is that life requires liquid water, Goldilocks planets are places where life might be possible.

If a planet is too close to its star—like Mercury in our solar system—then it will be too hot, and water will evaporate. If a planet is too far from its star—like Pluto—then it will be too cold, and water will freeze. The habitable zone where Goldilocks planets can exist is different for each solar system, based on things like the size and temperature of the star. Scientists have identified thousands of planets outside our solar system, but only a fraction are in the habitable zone.

Earth is our very own Goldilocks planet, and we have evolved to thrive here: in addition to liquid water, factors like Earth’s atmosphere, temperature range, gravitational force, seasons, light, and the interconnectedness among diverse ecosystems make human life possible. However, effects of climate change like global warming, extreme weather events, and sea level rise are making it harder for humans to survive on our own planet.

Some people think that humans will need to spread to other planets to avoid extinction, but we cannot escape the impacts of climate change by fleeing to a different Goldilocks planet. None of the planets identified so far have been confirmed to be able to support human life, and we don’t have the technology needed to reach them. We can learn a lot from studying other planets, and it is possible that we will someday—far in the future—be able to visit them, but our ability to survive relies on our success in things like climate adaptation, climate mitigation, and collective climate action here on Earth.

More Resources:

Carney, S. (Ed.). (2025). The habitable zone. NASA. https://science.nasa.gov/exoplanets/habitable-zone/.

European Space Agency. (n.d.). Planets in the habitable zone. https://www.esa.int/Science_Exploration/Space_Science/Plato/Planets_in_the_habitable_zone.

Krishna, S. (2020). What is the habitable zone? The Planetary Society. https://www.planetary.org/articles/what-is-the-habitable-zone.

Ghose, T. (2015). Why is water so essential for life? Live Science. https://www.livescience.com/52332-why-is-water-needed-for-life.html.

Kaufman, M. (2022). Life, here and beyond. Astrobiology at NASA. https://astrobiology.nasa.gov/about/.

Discovering and studying other planets

Carney, S. (Ed.). (2025). Exoplanets. NASA. https://science.nasa.gov/exoplanets/.

Lea, R. (2023). Exoplanets: Everything you need to know about the worlds beyond our solar system. https://www.space.com/17738-exoplanets.html.

Mutert, B. (2025). How astronomy helps us understand climate change. Adler Planetarium. https://www.adlerplanetarium.org/blog/how-astronomy-helps-us-understand-climate-change/.

Visiting and living on other planets

Bilén, S. (2024). Is it possible to make Mars like Earth? Astronomy. https://www.astronomy.com/science/is-it-possible-to-make-mars-like-earth/.

Jenet, F. & Creighton, T. (2015). If Earth falls, will interstellar space travel be our salvation? The Conversation. https://theconversation.com/if-earth-falls-will-interstellar-space-travel-be-our-salvation-35523.

Learn, J. R. (2021). Why haven’t humans reached Mars? Astronomy. https://www.astronomy.com/science/why-havent-humans-reached-mars/. Reuter, T. (2021).

Why the human race must become a multiplanetary species. World Economic Forum. https://www.weforum.org/stories/2021/12/humans-multiplanetary-species/.

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