The Destructive Impact of Gas Giants on Earth-like Planets in Other Star Systems

by Hiroshi Tanaka
Gas Giants Habitability

Recent scientific studies have uncovered the potential dangers posed by large gas planets in various star systems to the habitability of nearby Earth-like worlds. These gas giants often disrupt the orbits and climates of smaller planets, unlike the beneficial role Jupiter plays in our solar system. This research underscores the unique nature of our solar system’s planetary arrangement. The study includes an artist’s illustration of a star system crowded with massive planets, as presented by NASA’s Dana Berry.

These investigations also explore how these massive planets could hinder life in different solar systems.

In certain star systems, massive gas giants can wreak havoc, endangering the habitability of adjacent Earth-like planets. Research indicates that these large planets often displace smaller planets from their orbits and negatively impact their climates.

Jupiter, the largest planet in our solar system, has a vital protective role. Its significant gravitational field helps to deflect potentially dangerous comets and asteroids away from Earth, contributing to a stable environment conducive to life. However, in other parts of the universe, giant planets don’t always play a protective role for their smaller, rocky counterparts.

The Risk to the Habitable Zone

A recent paper in the “Astronomical Journal” explains how the gravitational influence of massive planets in nearby star systems can eject their Earth-like neighbors from the “habitable zone.” This zone refers to the range around a star where conditions are suitable for liquid water on a planet’s surface, a crucial factor for life.

The solar system HD 141399 serves as an interesting model for comparison with our own. Unlike most solar systems, its four giant planets are positioned further from their star, similar to the arrangement of Jupiter and Saturn in our system.

Stephen Kane, an astrophysicist at UC Riverside and the author of the study, likens these planets to “four Jupiters acting as wrecking balls,” disturbing the harmony of the system. Kane used computer simulations to analyze the effect of these giants on the habitable zone, particularly assessing if an Earth-like planet could maintain a stable orbit. The likelihood is slim, with only a few areas safe from the disruptive gravitational pull of these giants.

The Destructive Role Beyond the Habitable Zone

While one paper demonstrates the destructive impact of giant planets outside the habitable zone on life prospects, another paper in the “Astronomical Journal” addresses the similar effect of a single large planet within the zone.

The second study focuses on the star system GJ 357, located just 30 light years from Earth. This system includes a planet, GJ 357 d, situated in the habitable zone and previously thought to be about six times the mass of Earth. Kane’s paper, titled “Agent of Chaos,” suggests the planet could be much larger, potentially up to ten Earth masses, making it unlikely to be terrestrial and incapable of supporting life as we know it.

Kane and collaborator Tara Fetherolf, a postdoctoral scholar in planetary science at UCR, argue that if GJ 357 d is significantly larger than estimated, it would make it impossible for Earth-like planets to coexist in the habitable zone. Even if such planets were present, their orbits would be extremely elliptical, leading to extreme climates.

Kane’s research serves as a caution against assuming that planets in the habitable zone can automatically support life. His findings emphasize the rarity of conditions suitable for life in the universe and the exceptional nature of our solar system.


  1. “Surrounded by Giants: Habitable Zone Stability Within the HD 141399 System” by Stephen R. Kane, 10 October 2023, The Astronomical Journal. DOI: 10.3847/1538-3881/acfb01
  2. “GJ 357 d: Potentially Habitable World or Agent of Chaos?” by Stephen R. Kane and Tara Fetherolf, 20 October 2023, The Astronomical Journal. DOI: 10.3847/1538-3881/acff5a

Frequently Asked Questions (FAQs) about Gas Giants Habitability

How do gas giants in other star systems affect nearby Earth-like planets?

Gas giants in other star systems often threaten the habitability of neighboring Earth-like planets by disrupting their orbits and climates. Unlike Jupiter in our solar system, which protects Earth from comets and asteroids, these giant planets frequently destabilize conditions necessary for life.

What is the habitable zone in a star system?

The habitable zone in a star system is defined as the area around a star where the conditions are suitable for liquid water to exist on a planet’s surface. This zone is crucial for the possibility of life as we understand it.

Can Earth-like planets maintain stable orbits in systems with multiple gas giants?

It is challenging for Earth-like planets to maintain stable orbits in systems with multiple gas giants. Research shows that there are only a few areas in such systems where the gravitational influence of the giants does not disrupt the orbit of smaller, rocky planets.

What is the significance of the research on the HD 141399 and GJ 357 star systems?

The research on the HD 141399 and GJ 357 star systems highlights the potential destructive influence of gas giants on the habitability of Earth-like planets. It shows the rarity of conditions suitable for life in the universe and underscores the unique nature of our solar system.

What does the term “Agent of Chaos” refer to in this context?

The term “Agent of Chaos” refers to the role of a large planet, like GJ 357 d, in a star system’s habitable zone. This planet’s substantial mass can prevent the stability of other Earth-like planets in the zone, making it an agent of chaos in terms of habitability.

More about Gas Giants Habitability

  • Astronomical Journal Study on HD 141399
  • Gas Giants and Habitability Research
  • Jupiter’s Protective Role in Our Solar System
  • The Habitable Zone: Understanding the Concept
  • GJ 357 Star System Analysis
  • Planetary Orbit Stability and Gas Giants
  • Stephen R. Kane’s Research Publications
  • Astrobiology and Exoplanet Studies

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Sarah K. December 22, 2023 - 6:03 pm

Stephen Kane’s work is always groundbreaking, this is no exception. The universe is so much more complex than we ever imagine.

TommyG December 22, 2023 - 9:12 pm

is it just me or does the term “Agent of Chaos” sound like something out of a sci-fi movie? Love the drama in science sometimes haha.

Jenny C. December 22, 2023 - 11:25 pm

Wow this is super interesting, didnt know gas giants could be so destructive to other planets! Always thought Jupiter was just a big friendly giant.

Mike87 December 23, 2023 - 7:37 am

so does this mean we’re just lucky with Jupiter?? kinda makes you think about how fragile our own planet is…

AstroFan December 23, 2023 - 1:01 pm

the habitable zone concept is fascinating, but this research shows it’s not just about the distance from a star. Giant planets play a huge role too.


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