­xkcd thread

Every direction is pointing out to the sky. Some directions have a planet in the foreground, but that’s small shakes compared to 50,000 galaxies. And “in this circle” clearly means framed by the circle, which means that the 3d space so defined must be a cone.

Not a cylinder?

It’s a cone. If you held the phone at half the distance, it would appear to have twice the angular diameter, and “contain” four times the number of galaxies. That’s how cones work, not cylinders.

A cylinder would literally only be a few millimeters wide, even out to billions of light years. I don’t know if there would be many galaxies in that, or any at all. It may pass through a few, but that’s not the same idea.

The idea was more what you would see through that circle, if you could see to edge of the observable universe, would be around 50,000 galaxies.

Telescopes don’t look down a cylinder, they see a cone.

Right, duh. Thanks for the obvious answer to my dumb question.

They should just pay him $184,000.00 once every three years.

But I am sensing that he wouldn’t be a perfect fit for the company culture, so maybe it’s working out for the best.

It’s not like he was asking for anything irrational.

Boo! Hiss! * throws tomatoes at k9befriender *

EDIT: For years I misread your name as ‘K. B. Friendfinder.’ No idea where my brain got the ‘finder’ part from.

I really how secretive this joke is. Someone who doesn’t understand it won’t just see “oh, a joke I don’t get” but not see a joke at all. He never spoils out that the joke is that this is a common wrong style of reasoning.

Multiple wrong styles of reasoning. First, you’ve got the fact that spacecraft debris injuries are so rare that there’s no sense worrying about even a thousand-fold increase in the risk. Then you have “significance” defined in terms of the error bars, such that more precise measurement of the error bars would make the “significant” threshold smaller. And then, you also have a cumulative effect being treated as discrete, so that going inside after 4 hours and then going back again would keep your risk lower than just staying outside for the same total amount of time in one go.

EDIT: Oh, and also the non-uniform binning on the vertical axis, and the pointless log-scaling on the horizontal axis.

It also doesn’t take into account that most injuries due to spacecraft debris happen within two miles of the home.

Don’t know where you live, but in my neighborhood the greatest danger zone is from 55 to 300 miles (vertically)

You’ll want to click on this one today for the full output. Turn on your sound.

But all I get is some guy droning out some code. Boring!