At 22.1 kilometres above Earth, two American balloonists looked out their gondola in 1935 and saw something no human had clearly documented before: the sky turning black.
Albert Stevens and Orvil Anderson piloted Explorer II to that record altitude that year, with nearly all of Earth’s atmospheric mass beneath them. They were not astronauts by any conventional definition. But they may have been the first people to witness the death of the blue sky — the moment the atmosphere grows too thin to scatter sunlight and the ancient idea of a bright cosmos simply ends.
That question — who was actually first in space — turns entirely on how space gets defined. And the answer, according to the report, is messier than most people assume.
Where space begins
The two most commonly used thresholds are the Kármán line at 100 kilometres, set by the Fédération Aéronautique Internationale, and the US governmental boundary at 80 kilometres (50 miles). Both figures have what the report calls “messy origins.” Neither was designed to define space in any philosophical sense — they mark the practical limits of aerodynamic and aerostatic flight.
The Oxford English Dictionary takes a different approach entirely, defining space as the physical universe beyond Earth’s atmosphere. The problem: Earth’s atmosphere doesn’t end anywhere near those round numbers. Research now places the last detectable atmospheric atoms at roughly 630,000 kilometres from the planet. No human has reached that distance. NASA’s upcoming Artemis II mission will carry a crew approximately 7,500 kilometres beyond the moon — itself a record-breaking journey that will surpass Apollo 13 — but still more than 200,000 kilometres short of that outer boundary.
By the strictest scientific definition, no human has ever been to space.
The cultural threshold
There is a third definition, less precise but historically significant. For centuries, most Europeans believed space itself was blue. The day sky, as they saw it, was simply a window into the universe. Night was Earth’s own shadow. The concept of a black universe only began circulating among scientists in the 17th century, and it remained outside popular understanding until the edge of the Space Age — three centuries later.
From that perspective, the most meaningful boundary is not a number on an altitude chart. It is the point at which the atmosphere becomes too thin to refract sunlight and the blue disappears. The first person to fly high enough to witness that transition would have been, in cultural and intellectual terms, the first genuine eyewitness to the nature of the cosmos.
Stevens and Anderson were already close in 1935. Yuri Gagarin reached orbit on April 12, 1961, and is recorded in history as the first man in space. But if the defining experience is seeing the sky go black — watching a belief held for centuries dissolve in real time outside a pressurized window — the question of who crossed that threshold first remains, by the source’s account, genuinely open.
Photo by Pixabay
This article is a curated summary based on third-party sources. Source: Read the original article
