Space debris & Space Situational Awareness

Story hook

In the film Gravity, a single cloud of orbiting wreckage tears apart a space station and strands an astronaut. It is fiction — but the physics is frighteningly real. Today, more than 130 million fragments of human-made junk hurtle around Earth: dead satellites, spent rocket stages, flecks of paint, shards from collisions and explosions. Travelling at ~27,000 km/h, even a 1-cm bolt hits with the energy of a hand grenade. Astronauts on the International Space Station regularly shelter as debris whizzes past, and working satellites must dodge it.

The nightmare scenario has a name: the Kessler syndrome — a runaway chain reaction in which one collision creates debris that triggers more collisions, until parts of orbit become an unusable minefield. In March 2019, India added to the problem itself: the Mission Shakti anti-satellite (ASAT) test blew up one of its own satellites, scattering debris and drawing global criticism — even as it made India only the fourth nation with such capability.

Recognising the stakes, India has become a leader in Space Situational Awareness (SSA) — tracking what's up there to keep its ₹-thousands-of-crores worth of satellites safe. Through the NETRA project and the IS4OM control centre, and a pledge to make all its missions "Debris-Free" by 2030, India is trying to keep space usable for the future. Space debris is where technology, sustainability and security collide — literally.

Why this matters for UPSC

A fast-rising GS-III topic (space, sustainability, security). Prelims tests ISRO's NETRA and IS4OM, the Kessler syndrome, Mission Shakti (2019), and the Debris-Free Space Missions 2030 pledge. Mains and interviews use it for space sustainability, the commons/governance problem, and ASAT ethics. With the satellite boom (Starlink, mega-constellations), it is increasingly examined.