Wanted to follow up to say how ridiculous a microarcsecond is. It's approximately equal to 5e^-12 in radians, which at this level is approximately the ratio of

Wanted to follow up to say how ridiculous a microarcsecond is. It's approximately equal to 5e^-12 in radians, which at this level is approximately the ratio of width to distance. So, for example, it's like seeing a hydrogen atom from 7 meters away. Or a red blood cell from 400km away.