The GAIA mission obtains astrometric data of stars with accuracy in some cases better than 10 microarcseconds.In terms of angular width,what is this equal to?
A)A human hair viewed from a distance of 20 miles
B)A human hair viewed from a distance of 200 miles
C)A human hair viewed from a distance of 2000 miles
D)A human hair viewed from a distance of 20000 miles

Question

Quizplus · Accepted Answer

10 microarcseconds is equivalent to 1/3.6 millionth of a degree. From this, we can calculate that the angular width of 10 microarcseconds is approximately equivalent to the width of a human hair (0.1mm) viewed from a distance of 2000 miles.

The GAIA Mission Obtains Astrometric Data of Stars with Accuracy