How satellite constellations changed warfare and weather forecasting

For most of the space age, satellites were large, expensive, and few. A single reconnaissance satellite might take years and billions of dollars to build. Today, a new model has emerged: constellations of hundreds or thousands of smaller, cheaper satellites operating together in low Earth orbit. That shift has changed what satellites can do, who can afford them, and what happens when they are threatened.

What a satellite constellation is

A satellite constellation is a coordinated network of satellites positioned to provide continuous coverage of the Earth or large portions of it. Where a single satellite in high orbit covers a wide area but passes over any given point infrequently, a constellation in low Earth orbit can ensure that at least one satellite is always overhead. This makes services like broadband internet, positioning, and earth observation available continuously rather than intermittently.

The commercial sector has driven recent growth in constellation technology, reducing the cost of getting satellites into orbit through reusable launch vehicles and standardised small-satellite designs.

What they mean for warfare

Modern military operations depend heavily on satellites for communications, navigation, targeting, and intelligence. Constellations make this dependence more resilient: destroying one satellite in a network of hundreds degrades the system only slightly, whereas destroying a single large legacy satellite could cripple a capability entirely.

Commercial earth-observation constellations have also changed the information environment of conflict. High-resolution satellite imagery that once required state-level resources is now available commercially, meaning journalists, researchers, and governments without their own reconnaissance satellites can monitor troop movements, infrastructure changes, and damage assessments in near real time.

What they mean for weather forecasting

Weather satellites have been crucial to forecasting for decades, but constellations have added a new layer of data. Small satellites carrying radio occultation instruments can measure temperature, pressure, and humidity profiles through the atmosphere at many points simultaneously, feeding better data into the numerical models that produce forecasts. More data points mean more accurate initial conditions, and better initial conditions produce better forecasts several days out. For a country like Australia, where extreme weather events have major agricultural, safety, and economic consequences, improved forecast accuracy has real practical value.

What it means for Australia

Australia operates in a part of the world where space-based communications and positioning underpin vast distances, remote industries, and defence arrangements. The country is developing its own space sector and participates in arrangements with allies that depend on space-based assets. The Bureau of Meteorology relies on satellite data for its forecasting, and Australian agriculture and emergency management depend on accurate weather prediction. At the same time, the growing militarisation of space raises questions for Australia about how to protect or replace satellite-dependent capabilities if they were disrupted in a conflict.

The bottom line

Satellite constellations have made continuous, resilient coverage affordable, which matters for both military planners and meteorologists. For Australia, the consequences are concrete: better weather forecasts and more exposure to the vulnerabilities of space-dependent systems.

This article was compiled by AI and screened before publishing. See our editorial standards.