What Are Small Satellites?
A small satellite, or 'smallsat', is any satellite with a mass under 500 kilograms. They range from 'minisatellites' (100-500 kg) down to 'nanosatellites' and 'CubeSats', which can be as small as a shoebox or even a Rubik's Cube. This downsizing is made
possible by the same revolution in microelectronics that put a supercomputer in your pocket. Instead of large, multi-purpose, and incredibly expensive spacecraft that take years to build, smallsats are designed to be agile, affordable, and mass-produced. The most famous standard is the CubeSat, a 10x10x10 cm unit that can be stacked together to build larger, more complex satellites. This modular approach has dramatically lowered the barrier to entry, allowing universities, startups, and smaller nations to access space.
The Big Advantages of Going Small
The primary driver of the smallsat revolution is cost. They are significantly cheaper to build and launch than their traditional counterparts. Many are launched as 'rideshare' payloads, piggybacking on larger rocket missions, which drastically reduces launch complexity and expense. This affordability allows organisations to deploy entire constellations of dozens or even thousands of satellites. Operating as a coordinated network, these constellations provide persistent, near-continuous coverage of the globe, something a single large satellite cannot achieve. This model also mitigates risk; if one smallsat in a constellation fails, the financial loss is minimal compared to the failure of a single, multi-billion-dollar mission. Development cycles are also much faster, allowing companies to iterate and deploy new technology in months rather than years.
Smarter Services from Orbit
So, what do these small satellites actually do? They are the backbone of a growing number of 'smarter' services. Earth observation (EO) is a major application, with companies like Planet Labs and Spire Global using their constellations to provide high-frequency imagery for industries like agriculture, disaster response, and environmental monitoring. This data helps farmers with precision agriculture, enabling them to monitor crop health, optimise irrigation, and increase yields sustainably. Global connectivity is another key area. Companies are building constellations to provide broadband internet and Internet of Things (IoT) connectivity to remote and underserved areas. This enables everything from tracking shipping containers across oceans to connecting environmental sensors in remote wilderness.
India's Growing Role in the Smallsat Economy
India is rapidly emerging as a key player in the global small satellite market. The Indian Space Research Organisation (ISRO) developed the Small Satellite Launch Vehicle (SSLV) specifically to cater to this growing demand, offering low-cost, on-demand launches for satellites up to 500 kg. This capability is crucial for both domestic needs and attracting international customers. Beyond ISRO, a vibrant private space ecosystem has flourished since the sector was opened to private investment in 2020, with nearly 400 startups now in the fray. Companies like Skyroot Aerospace and AgniKul Cosmos are developing their own launch vehicles for small payloads. Meanwhile, startups like Pixxel are building constellations for hyperspectral imaging, and Dhruva Space offers full-stack satellite solutions.
The Challenges Ahead
The explosive growth of small satellite constellations is not without its challenges. The most significant concern is space debris. With thousands of new satellites being launched, the risk of collisions increases. Even a tiny fragment travelling at orbital speeds can cause catastrophic damage to an active satellite or the International Space Station. This has led to a hypothetical scenario known as the Kessler Syndrome, where a cascade of collisions could render certain orbits unusable for future generations. As a result, there is a growing call for better international regulations, sustainable practices like designing satellites that de-orbit themselves at the end of their life, and the development of technologies to actively remove debris from orbit.
