As we roll into February of 2025, it has certainly been a heck of a ride, so far. No matter whether you love President Donald J. Trump or hate him, he has certainly been kicking over a lot of apple carts. While many people are definitely up in arms over his wielding of Elon Musk’s hammer to trim the government’s budget, the silver lining is that there is going to be a lot more money available for things that actually benefit society as a whole, as happened before, and the “Big Kahuna” is a real ‘return to space’. (But not for Mars…like, seriously.)
Instead, this week we are not going to focus on US politics, nor on the international military scene. Instead, we’re going to revisit warfare in space. Our previous article from August of 2024 focused mainly on the tactical side of warfare in space – focusing on G. Harry Stine’s “Confrontation in Space” – here, we are going to expand on those ideas, looking into how true combat operations in space are inherently derived from concepts in naval warfare in the Age of Sail…So yes, all of those who are heavily invested in historical naval strategy…and pirates…congratulations – you may have a new career ahead of you as a space-war advisor…and maybe even a real combat spacecraft captain.
In this, as you should have noted from the title of this article, we’re going to talk about a man most people have never heard of: Sir Julian Corbett. Corbett, although not a naval officer, authored some of the most influential texts on naval strategy in the 20th Century, rivaling the breadth of his contemporary, the United States Navy Admiral Alfred Thayer Mahan, which both theories actually compliment each other, rather than compete. Corbett’s best-known work on naval warfare, “Some Principles of Maritime Strategy“, were so influential that the United States Navy War College approved a paper, titled “Corbett In Orbit” in 2004.
However, when those works were written, there was a lot more about space mechanics that were unknown, and the most significant of those was the discovery of the ITN…which is going to require a brief digression into the “Egg Head Realm” of real science.
The Interplanetary Transport Network(ITN), formally identified in the early 2000s, represents a breakthrough in our understanding of efficient space travel. This network consists of gravitationally determined pathways through the solar system, created by the complex interactions of gravitational fields between celestial bodies. These pathways, sometimes called low-energy transport routes, allow spacecraft to move through space with minimal propulsion requirements, though at the cost of longer transit times.
The ITN’s theoretical foundation lies in the mathematics of dynamic systems and the solutions to the “three-body problem” in orbital mechanics. While the gravitational interactions between two bodies (like Earth and a satellite) are relatively straightforward to calculate, adding a third body creates complex dynamics that can be leveraged for efficient space travel. These dynamics create a network of pathways that connect various gravitationally significant points throughout the solar system.
Key to understanding the ITN are Lagrange points – positions in space where gravitational forces and orbital motions interact to create areas of relative stability. These points serve as natural “nodes” in the network, particularly useful for positioning space stations or other infrastructure. The L4 and L5 Lagrange points are especially significant as they are naturally stable, requiring minimal energy expenditure to maintain position. L1, L2, and L3 points, while less stable, still require significantly less energy for station-keeping than arbitrary points in space.
The Lagrange points, it is vital to understand, are both close-in to Earth, as described by Stine, but also exist in the Sun-Earth system, with the Earth taking the place of the Moon in relation to the Sun. Likewise, the Lagrange point system, both planetary-lunar and Sun-planet scales, is duplicated with every planet in the Solar System. Per Stine, the terms for these areas are “cis-Lunar space” (the area inside the Earth-Moon system), and “trans-Lunar space” (the area beyond the Moon).
In a functional sense, this means that the ITN resembles a network of freeways on a map, but practically speaking, the ITN is more akin to the wind and ocean currents, with the Lagrange points acting like islands and atolls.
The practical implications of the ITN are substantial. Spacecraft using these pathways can dramatically reduce their fuel requirements compared to traditional transfer orbits. This efficiency comes at the cost of longer transit times, as vessels must essentially “coast” along these gravitational corridors. However, for many space operations, particularly those involving cargo or infrastructure, the trade-off between time and fuel efficiency often favors using the ITN over trying to “bull through” under constant thrust.
The network becomes particularly relevant as humanity expands its presence in space. The ITN’s pathways naturally connect regions of space that are gravitationally significant, including many resource-rich areas. Near-Earth asteroids, the lunar environment, and even the outer solar system become more accessible through these low-energy corridors. This accessibility has profound implications for space resource utilization and the establishment of permanent space infrastructure.
Space stations or bases positioned at ITN junctions, particularly near Lagrange points, would require minimal station-keeping fuel while maintaining access to multiple transport pathways. This positioning creates natural locations for refueling depots, trading stations, and other infrastructure necessary for expanding space operations. The efficiency of the ITN makes such installations more economically viable by reducing their ongoing operational costs.
The strategic implications of the ITN mirror historical patterns of maritime commerce and naval operations. Just as terrestrial shipping lanes developed along routes determined by ocean currents and prevailing winds, space commerce would naturally tend to follow these efficient pathways. This creates predictable routes that become strategically significant, similar to how maritime choke points have historically shaped naval strategy and commerce protection.
Current technology allows for practical utilization of the ITN, particularly with advances in autonomous navigation and precision orbital mechanics. Modern spacecraft can maintain position along these pathways with minimal correction burns, making them increasingly attractive for both commercial and government space operations. As launch costs continue to decrease and space activity increases, understanding and utilizing the ITN becomes increasingly crucial for efficient space operations.
The identification and mapping of the ITN represents a fundamental shift in how we approach space travel and infrastructure development. Rather than fighting against the complex gravitational environment of space, the ITN allows us to work with natural gravitational dynamics. This approach, while requiring longer transit times, offers substantial benefits in terms of fuel efficiency and operational sustainability.
So…What does all this have to do with Julian Corbett, Mahan, and naval strategy under sails?
In brief, wars – video games aside – are never fought “just because”. They are always fought for some tangible goal to the initiator of the conflict. Whether that goal is territory, resources, or “national image”, the initiator has a reason for engaging in warfare. How does this strategic model apply in space?
Humans, as a species, are long past going to space as a stunt. If governments – or companies – want to get the money necessary to go to space, they need to offer tangible benefits for doing so. And, just as on Earth, those “tangible benefits” are going to be resources like water and mineral wealth, or control of the movement of those resources.
While people may want – and justifiable so – to use space peacefully, for good or ill, that is not the normal scope of human behavior: we will almost certainly see warfare in space, and war has rules. The ITN is the dominant feature of the “high ground” of trans-Lunar space: control of, and movement along, the ITN is the “make or break” aspect of commerce in space, and thus, will be the focus of “War in the Black”.
The ITN offers both cheap avenues of movement, but also points of control. Short of science-fiction “technobabble” solutions to space propulsion and artificial gravity, coasting along the ITN routes is how we are going to expand off of Earth. And militarily, the ability to accelerate, then coast, enhances a warship’s stealth, as it is not under constant thrust, allowing it to fade into the background. As long as extreme speed is unnecessary, this is the perfect balance, allowing ships to speed along to a base at an ITN Lagrange point, to refuel and reprovision; to “park” a Battle of the Atlantic-style “wolfpack” at those points, or to make sudden shifts into planetary Lagrange systems.
The sky, as they say, is the limit in what the ITN allows for.
Looking forward, the ITN will play a crucial role in the development of cis-Lunar space and beyond. As humanity establishes a permanent presence beyond Earth, these natural pathways will shape the pattern of space development, influence the positioning of infrastructure, and determine the most efficient routes for commerce and exploration. Understanding and utilizing the ITN will be essential for any serious long-term space operations, whether commercial, scientific, or strategic in nature.
And someone is eventually going to fight over it.
