3QUESTION 3 OF 3
Answer & explanation
Anyone who has crossed the Kármán line
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
690
people
How to estimate it
Fermi’s official “Napkin math”
No population to lean on, so use the calendar. People have been going to space since about 1961, roughly 65 years. How many new people get up there in a year? Not many, maybe a dozen.
- Years since 1961
- ~65
- New people per year
- ~11
- 65 × 11
- ≈ 700
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- FAI threshold (Kármán line)
- 100 km
- Of whom Blue Origin suborbital fliers
- 92
- Same tally on the lower US 80 km line
- ≈ 780
- Unique humans above 100 km, 1961 to 2026
- ≈ 690
Reference cited by Fermi: FAI / Space Foundation
How close was your guess?
Your comparison will appear here.
Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.