Satellites in orbits below about 400 km typically reenter within a few years without propulsion, while those above about 1,000 km can remain in orbit for centuries.

Is it true that satellites in orbits below about 400 km typically reenter within a few years without propulsion, while those above about 1,000 km can remain in orbit for centuries?

Unclear. Two sources partially support the low-altitude half of the claim: NASA notes natural decay within under five years for most SmallSats below 400 km, and an orbital-decay modeling paper reports decay within weeks at 200 km. Neither addresses the claim's second half, that satellites above about 1,000 km can remain in orbit for centuries; the modeling paper instead says lifetimes at 800-1000 km extend only to several decades.

Verdict: PARTIAL LEAN · 3 sources for, 0 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

How long would a satellite remain in orbit at the Karman Line?. (2024). space.stackexchange.com. https://space.stackexchange.com/questions/67194/how-long-would-a-satellite-remain-in-orbit-at-the-karman-line

Modeling Orbital Decay of Low-Earth Orbit Satellites due to Atmospheric Drag: A Simplified Analytical Approach. (n.d.). arxiv.org. https://arxiv.org/html/2508.19549v1

13.0 Deorbit Systems - NASA. (n.d.). nasa.gov. https://www.nasa.gov/smallsat-institute/sst-soa/deorbit-systems/