The rapid increase in satellite launches is pushing Earth's orbit towards a dangerous tipping point, with experts warning of catastrophic consequences if action is not taken. From the launch of Sputnik in 1957 to the current era of megaconstellations, the number of satellites in orbit has surged from about 6,000 in 2022 to a projected 60,000 by 2030. This growth, coupled with a 'throwaway culture' in space, has led to a massive accumulation of debris.
According to the European Space Agency, nearly 37,000 objects larger than 10cm are being tracked, but over one million pieces between 1cm and 10cm are 'lethal and non-trackable', says John Janka of Viasat. These fragments cannot be seen, avoided, or shielded against, posing a constant threat to operational satellites.
The Kessler effect, a theory from 1978, warns that as satellite numbers increase, so does collision probability, leading to an unstoppable cascade of debris that could render entire orbits unusable. A 2022 paper by Viasat describes a scenario where 'all of humanity would watch helplessly as space junk multiplies uncontrollably', potentially ending the space age and trapping humanity under a layer of trash for centuries.
Size also matters: larger satellites have a greater cross-sectional area, increasing collision risk and debris generation. While manoeuvring satellites to avoid collisions is a common mitigation strategy, experts like Hugh Lewis of the University of Southampton argue that collision avoidance is a 'misnomer' because the risk never fully disappears. With the sheer number of future satellites, the challenge is immense.
Solutions include better tracking, de-orbiting non-manoeuvrable satellites, and updating international regulations, which currently rely on the 1967 Outer Space Treaty. Companies like Astroscale UK are developing in-orbit servicing to address the problem, but without timely intervention, the space age could face an inglorious end.
