This is a dilemma a good deal of house nerds — and, apparently, Jeff Bezos’ team at Blue Origin — treatment a great deal about.

There is no one definition of “outer house.” And selecting the place place starts is largely an training in pinpointing accurately the place the Earth’s environment results in being much less troublesome than the Earth’s gravitational pull. But there is no specific altitude in which that transpires. The environment thins out, but the “vacuum of place” is never definitely devoid of matter totally. It really is a blurry line.

In which does room start out? Does it start off when you seem up, and the sky goes from blue to dim and speckled with stars? What about when you just go so large enough that you float, like you see with astronauts on the room station?

Effectively astronauts on the room station really don’t float simply because they’re so high up, it really is since they’re in orbit. To put it plainly, according to NASA, emphasis ours:

An orbiting spacecraft moves at the appropriate speed so the curve of its fall matches the curve of Earth. Mainly because of this, the spacecraft keeps falling toward the ground but hardly ever hits it. As a final result, they tumble around the planet. The moon stays in orbit all over Earth for this exact same reason. The moon also is falling all around Earth.

And when Branson and his crew is not going to be heading into orbit, they will be dealing with microgravity, as they freefall from the peak of their journey, very very similar to what astronauts expertise on the ISS. Besides they’re not shifting at over 17,000 mph like the people today on the ISS, so the SpaceShipTwo will appear screaming again down to Earth somewhat than repeatedly circling the planet.

But when it comes to suborbital — AKA flights that really don’t drum up sufficient speed to enter Earth’s orbit — Branson and Bezos’ place companies are fixated on what altitude they achieve.

Branson’s flight now is predicted to access more than 50 miles substantial, which is the altitude the US governing administration considers the beginning of outer place.

Bezos’ flight on July 20 will strike extra than 62 miles higher — also acknowledged as the Kármán line — which is the altitude internationally acknowledged as the boundary.

Specifically which is suitable — the US-approved 50-mile mark or the internationally acknowledged 62-mile Kármán line — is commonly debated and generally arbitrary.

But when we say the worldwide group “acknowledges” or “accepts” the 62-mile Kármán line as the edge of room, we’re mostly talking about one particular firm: The the Fédération Aéronautique Internationale, which retains observe of entire world records in spaceflight these as tallying how numerous persons have become astronauts.

But even the FAI has stated it truly is regarded as modifying its definition to the US-recognized 50-mile mark in reaction to investigation from Jonathan McDowell with the Harvard-Smithsonian Center for Astrophysics.

What you should know: It really is not a massive deal. And folks that fly on Virgin Galactic and Blue Origin — equally US-dependent businesses — will still be in the American-identified version of outer area. (Although it need to be mentioned, neither corporation is sending passengers to orbit.)

Nonetheless, Blue Origin took the option on Friday to make the outer-area-definition debacle into a Twitter argument.