Formation, Quantity, and the Dangers to Satellites Essential for Climate Monitoring, Telecommunications, and Scientific Data

by Marco Arezio

In a previous article, we discussed the pollution of ocean floors caused by space mission debris that was left to sink. Today, we will talk about space debris orbiting the Earth and the dangers it poses.

Space debris, or space junk, is an increasing threat to orbital activities and, indirectly, to Earth. These fragments of defunct satellites, spacecraft, and other artificial objects continue to orbit our planet at extreme speeds, creating hazards not only for space operations but also for a range of services essential to everyday life on Earth.

Meteorological services, environmental monitoring, telecommunications, and satellite navigation all rely on satellites operating in orbit.

In this article, we will examine how space debris forms, how much of it exists today, and what problems it can cause both in space and on Earth.

Formation of Space Debris

Space debris is a byproduct of human activity in space, which began with the launch of Sputnik 1 in 1957. Every space launch leaves behind debris, such as spent rocket stages, parts of satellites, and fragments caused by explosions or collisions.

The main causes of space debris formation include:

Explosions in orbit: Components like fuel tanks or batteries can explode due to technical failures or deterioration, releasing thousands of fragments.

Collisions between space objects: These events generate a significant amount of debris, as demonstrated by the collision between the commercial satellite Iridium 33 and the inactive Russian satellite Kosmos 2251 in 2009, which produced over 2,000 new pieces of debris.

Decommissioned satellites and spacecraft: Many satellites, once their missions are complete, remain in orbit for decades, continuing to pose a potential threat.

With the increasing number of commercial and military launches, the volume of space debris is growing exponentially, creating a dangerous environment in space around Earth.

Quantity and Distribution of Space Debris

It is currently estimated that there are over 36,000 large objects (greater than 10 cm) in orbit, monitored by space surveillance networks.

Additionally, there are about 1 million fragments between 1 and 10 cm in size and over 130 million smaller fragments. Even small pieces of debris can pose a significant threat due to the high speeds at which they travel (around 28,000 km/h).

The main orbital regions:

Low Earth Orbit (LEO): Between 200 and 2,000 kilometers above Earth's surface. Most Earth observation satellites, communications satellites, and the International Space Station (ISS) are located here.

Geostationary Orbit (GEO): Around 36,000 kilometers above Earth, it is home to communications and weather satellites, which operate in fixed positions relative to Earth's surface.

Medium Earth Orbit (MEO): Between 2,000 and 35,786 kilometers, this orbit is mainly used by GPS satellites.

These orbits are becoming increasingly crowded, raising the risk of collisions that, in turn, create more debris. This phenomenon, known as the "Kessler syndrome," suggests that beyond a certain threshold, the growing volume of debris could trigger a chain reaction, making certain orbits unusable for long periods.

Impacts of Space Debris on Earth

Although space debris orbits the Earth, the effects of their interactions can directly impact many aspects of daily life.

Damage to Weather Monitoring Satellites

Weather satellites provide essential data for weather forecasts, climate change monitoring, and the detection of extreme atmospheric events like hurricanes, storms, and droughts. Space debris threatens these satellites, especially those in geostationary orbit.

A collision could compromise the ability to provide accurate and timely forecasts, with serious repercussions for sectors like agriculture, water resource management, and public safety.

A recent example involves the International Space Station (ISS), which has had to perform emergency maneuvers multiple times to avoid collisions with space debris. If weather satellites were also hit, it could lead to delays in climate observations and reduced accuracy in forecasts.

Disruption of Global Communications

Many telecommunications satellites operate in geostationary orbit, which is densely populated with space debris. A collision with a telecommunications satellite could disrupt mobile phone services, internet, satellite television, and radio broadcasts, causing widespread outages globally.

Loss of Satellite Navigation Services

GPS satellites, which mainly orbit in medium Earth orbit (MEO), are essential for navigation, whether for cars or air and maritime transportation systems.

An interruption or loss of precision caused by damage to one of these satellites could create global disruptions, affecting logistics operations, transportation safety, and even the functioning of financial services and energy infrastructures that depend on the precise synchronization provided by the GPS system.

Compromise of Environmental Monitoring

In addition to weather satellites, many satellite constellations are designed to monitor Earth's environment, detecting pollution levels, wildfires, deforestation, and the melting of polar ice caps. Their disruption could slow response times to environmental emergencies, reducing the ability to mitigate natural and man-made disasters and analyze climate changes.

Danger to Human Missions in Space

Space debris not only poses a threat to satellites but also to crewed space missions. The ISS, which orbits about 400 kilometers above Earth, must continually maneuver to avoid collisions with debris fragments. Even a small object could cause irreparable damage to the station or, worse, endanger the lives of astronauts.

Conclusion

Space debris represents a growing challenge for the future of space operations and life on Earth. As space activities increase, the accumulation of debris continues to worsen, threatening satellites essential for communication, navigation, and monitoring the planet.

Without timely intervention, the Kessler syndrome could become a reality, limiting safe access to space and jeopardizing the global infrastructure that depends on satellite technologies.

It is crucial that space agencies, international organizations, and private companies collaborate to develop sustainable solutions, such as improving debris removal techniques and adopting stricter regulations to prevent the creation of new debris.

Safeguarding Earth's orbit is essential not only to ensure the future of space exploration but also to protect the vital services we rely on every day on Earth.