Zephyrin Xirdal
Uli Kusterer (Not a kitteh)TIL: If you are under 23 years of age, there has never been a day in your life where all humans have been on planet Earth. (because there's always been someone on ISS since then)
Lord 🪟 @uliwitness And you’ve lived in only one century/milennia.
@lord You're thinking of the reverse of my statement. Gagarin etc. have only been off Earth temporarily, there have been many days in between where no humans have been off Earth.
Stanisław Zlotos 
@lord @uliwitness (except for the ones born in nov/dec 2000!)
LilyoftheRally@lord @uliwitness I think "millennium" is singular ("millennia" is plural).
Julien Avérous – 🇫🇷🇪🇺🇺🇦@uliwitness @bigzaphod But for airplanes ? I guess there is always one flying somewhere, with people taking off before another one in landing.
@javerous @bigzaphod I have no clue, I just got my info from NASA (which technically was "we're nearing the date”, so could be a few days off — ISS went operational sometime in Nov. 2000, apparently). I don't think they'd count being inside the atmosphere of Earth as “not being on planet Earth” even if you're not on the ground.
Ian Douglas Scott@uliwitness
@javerous @bigzaphod "Space" is conventionally defined to start 100km above sea level, so Nasa would probably define "on Earth" here as anywhere below that.
@javerous @bigzaphod "Space" is conventionally defined to start 100km above sea level, so Nasa would probably define "on Earth" here as anywhere below that.
@ids1024 @uliwitness @bigzaphod I wasn't aware of that, thank you, it's interesting ! I guess it's the Kármán line ? (I searched).
Eric Lawton
Paul McGrane@uliwitness @bigzaphod well … when's the first day there's always been an airplane aloft?
Julien Avérous (@[email protected])
@[email protected] @[email protected] But for airplanes ? I guess there is always one flying somewhere, with people taking off before another one in landing.
random thoughts@pmcg @uliwitness @bigzaphod Good question, my guess is since late 1930s when there were enough military aircraft and around the globe one would be flying at any time.
@hittitezombie @uliwitness @bigzaphod I think that's a good supposition. I might have guessed earlier, but since I required always, I think you're correct to estimate around then.
The problem is 'always', right?
You've got Pacific ocean and Asia which take a lot of timezones. If we were looking at only Europe and US it could have been earlier, but Pacific requires a strong naval air presence in Hawaii, Japan and India - and that comes with Japanese military complex, and invasion of China.
At least that's my reasoning.
@hittitezombie @uliwitness @bigzaphod I think your expectation of late 1930's was later than I figured but had good reasoning.
CGdoppelpunktAnd some were just jumping.
wraptile@uliwitness there's always an airplane in the air too! This fact will be very cool when we eventually have someone permanently on another planet.
grindhold@uliwitness i think you can bump this up a few years as the manned space station MIR has been existing before the ISS https://en.wikipedia.org/wiki/Mir :)
D C Ross@grindhold
The crew of Mir left on August 28, 1999, leaving it empty until April of 2000. The last two cosmonauts left in May of that year leaving Earth orbit empty of human life again. The station finally deorbited in early 2001.
The first crew of the ISS didn't arrive until November 2 of 2000, so that date marks the start of the current streak of continuous orbital habitation.
@deeseearr dayum :/ thanks for clarifying
Comrade elronxenu@uliwitness And if you're under like 51 you've never lived while humans have set foot on the moon.
@uliwitness
And if you are less than 19 years old, you have always lived next to a planet populated entirely by robots.
And if you are less than 19 years old, you have always lived next to a planet populated entirely by robots.
Xepher