How Does the Space Station Avoid Space Debris?

Startled, Hyeongseop turned to Byeoli.

“Byeoli, what’s that? Is it dangerous?”

“That’s space debris, old satellite fragments or leftover rocket parts drifting around in space. Even though they’re small, they move at incredible speeds, so a collision could cause serious damage.”

“So how does the space station avoid things like that whenever they come close?”

“Mission control on the ground constantly tracks the positions of space debris with radar. If something looks like it’s getting too close to the station, they calculate ahead of time and fire the station’s thrusters just slightly, nudging its orbit a tiny bit. That small shift is enough to steer clear of the danger zone.”

“So they change direction by a lot?”

“No, only by a tiny amount. Moving just a few kilometers to the side is usually enough. But maneuvers like this have to be calculated and prepared days in advance.”

Hyeongseop watched the red dot on the screen slowly drift away.

“What if something appears suddenly with no time to avoid it?”

“For situations like that, the station has special reinforced shielding built into its walls. That shielding can stop very small debris fragments. And if the danger is judged serious enough, astronauts can move into an emergency escape spacecraft to be ready just in case.”

“How much of that kind of trash is actually up there?”

“More than tens of thousands of tracked pieces alone. They’re all traces left behind by rockets and satellites humanity has launched over the years. That’s why, these days, people are also working on ways to burn up satellites safely in the atmosphere once they’re no longer needed.”

“Is space debris going to just keep piling up?”

“Unfortunately, at the current pace, that seems likely. So recently, scientists have also been researching ways to actively collect space debris using nets or robotic arms. Space has reached the point where it needs some cleaning up too.”

“Have satellites ever actually crashed into each other?”

“It’s happened before. Two broken satellites once collided by accident and created thousands of fragments. Those fragments are still drifting through space today, threatening other satellites. That’s why the path of every new satellite launch gets calculated with great care.”

Hyeongseop was amazed that something too small to even see could pose such a serious threat. And the thought of the space station quietly circling its orbit, carefully dodging each tiny danger one at a time, felt to him like a careful, brave kind of voyage.