Reentry
What happens when space objects come home — the fiery physics of returning from orbit and why predicting where debris lands is so difficult
space terms
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Space Object Catalog
The master ledger of everything orbiting Earth — how tens of thousands of satellites, rocket bodies, and debris fragments are tracked and numbered
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Space Domain Awareness (SDA)
The evolution from simply tracking objects in orbit to understanding the full strategic picture of who is doing what in space — and why
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Two-Line Element Set (TLE)
The compact data format that describes every tracked satellite orbit in just two lines of text — and how to read it
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Apogee and Perigee
Understanding the high and low points of every orbit - from the International Space Station's careful dance with Earth's atmosphere to the extreme ellipses that take satellites to the edge of space and back.
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Space Situational Awareness (SSA)
How our ability to track and predict objects in orbit has become the foundation of space safety in an increasingly crowded cosmic neighborhood