Fermi question · Technology
About how many functioning satellites were in Earth orbit at the end of July 2026?
Make a fast, defensible estimate before you reveal the reference answer. Think in factors, not exact recall.
What is your estimate?
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Reference answer
Reveal the reference answer
≈ 16 thousand satellites
Fermi estimates are judged by scale, so a reasonable approximation can still earn a strong score.
One way to estimate it
Start from the size of the largest commercial constellations, then add the rest of the world.
- Large constellationsorder of 10,000 satellites
- Other operators and governmentsseveral thousand more
- Estimate≈ 15,000–20,000 functioning satellites
Keep practicing
Try another question, or return to the daily challenge to build your personal sense of scale.