How small is the black hole image?

13:12>> That photograph is really really small >> in the night sky. Okay, that thing is about 50 microarch seconds across. So let's get to how how actually big that is. Right. >> So um >> this is from the Babylonian time. >> I want to quickly 40 micro, not 50 micro. >> Oh yeah. Well 40 to 50. There's like a scale bar in there that says 40. It's like it's nebula. It's like, okay, if I measure this way, it's like 60. If I measure this details, details, you know what I mean? No. No. Totally fair. Totally fair. >> Yeah. But at the end of the day, it's it's something like tens of micro arcseconds. Yes. Across, right? >> Yes. >> Now, how big actually is that in the

13:53night sky? So, um, astronomers use the degree system that we have inherited from the Babylonians and they just like took that to the >> Shout out to the Babylonians. >> Yeah. Shout out to the Babylonians. way back they said a full circle is 360°. So the astronomers said okay a full circle in the night sky is 360°. So a a single degree is 1 360th of a full circle. That makes sense. The moon is about half a degree which means it would take 720 moons lined up to make a full circle. Does that make sense? Right. So the moon is about half a degree. Each degree has 60 arc minutes

14:33and each minute has 60 arc seconds, right? The same way that we use hours and minutes and and seconds in like normal timekeeping. So that's the idea. You've got um you got you got half a degree. So that's 30 ark minutes is the moon. >> Mhm. >> Right. Because an hour would be a full degree. >> Yes. >> Okay. So the moon is 30 ark minutes which means it's um 60 arcsec to a minute. So that's 1,800 arcseconds. >> Yes. >> Right. So imagine taking the moon and dividing it up into 1,800. That's that's a single arcsec. And then now a micro arcsec is a millionth of that.

15:13>> Okay. To give you an idea, you see that donut? You remember that donut?