Most Trending
June 3, 2026
pursue guide
Silas Varma May 11, 2026 3 min read

Cleaning the Sky with Kevlar and Math

Cleaning the Sky with Kevlar and Math
All rights reserved to pursueguide.com
Think about how much trash we deal with on the ground. Now, imagine that same problem 300 miles above your head, moving at thousands of miles per hour. That is the reality of low-Earth orbit right now. It is getting crowded up there, and when a satellite dies, it does not just disappear. It stays in the way. To solve this, engineers are building new types of 'remediation' satellites. These are basically space tow trucks designed to grab old junk and pull it down so it burns up in the atmosphere. But catching a dead satellite is not as simple as just reaching out and grabbing it. You have to deal with the harsh environment of space, which is where Kevlar comes in. You might know Kevlar from bulletproof vests, but in space, it is used as a shield. It is woven into composites that can take a beating from tiny bits of space dust without falling apart. These shields protect the cleanup craft while it does its job.

Who is involved

The people working on this are a mix of space agency scientists and private company engineers. They are the ones who have to figure out the path these satellites take. It is a group effort involving mathematicians who track the debris and pilots who remotely steer the cleanup craft. They use very specific tools to make sure they do not miss their target.
  • Space traffic controllers who monitor the busiest lanes in orbit.
  • Material scientists who test how Kevlar holds up against atomic oxygen.
  • Navigation experts who plan the safest way to approach spinning junk.
  • Engineers who build the nets and arms used to catch the debris.

The Invisible Wind in Space

You might think space is a total vacuum, but it is not quite empty. In low-Earth orbit, there is still a tiny bit of air. It is very thin, but when you are moving as fast as a satellite, that thin air acts like a headwind. We call this atmospheric drag. To move through it safely, engineers use something called the NRLMSISE-00 model. Think of it as a super-accurate weather map for the very top of our atmosphere. It tells the team how thick the air is at any given moment. This matters because the sun can heat up the atmosphere and make it expand. When the air expands, the drag gets stronger, and the satellite slows down more than expected. If you do not account for this 'wind,' your satellite might end up in the wrong place or even fall back to Earth too soon.
The secret to a successful mission is knowing exactly how the air and the sun will push you around before you even launch.

Sunlight as a Physical Push

Believe it or not, even sunlight can move a satellite. It is called solar radiation pressure. It is a tiny force, like a light breeze hitting a sail, but over days and weeks, it can knock a satellite off its intended path. The team has to calculate exactly how much the sun is pushing on the Kevlar body of the craft. They also look at how the Earth is not a perfect ball. It is a bit fat around the middle, which means gravity is not the same everywhere. This 'oblateness' tugs on the satellite in weird ways. By crunching all these numbers, the team can predict exactly where the satellite will be at any second. This is how they avoid hitting other active satellites while they are busy hunting for junk. It is a high-stakes game of keep-away played with millions of dollars of hardware.