In order to be able to directly see the Sun's motion due to Jupiter's gravity, an observer at a distance of 30 light- years would need to be able to measure changes in its position of _.
A)0)05 arcsecond
B)0)5 arcsecond
C)0)0005 arcsecond
D)0)005 arcsecond

Question

Quizplus · Accepted Answer

Changes in position due to Jupiter's gravity on the Sun are extremely small, on the order of a few milliarcseconds. At a distance of 30 light-years, this corresponds to a change in position of about 0.0005 arcseconds. Choice A and B are too large, while choice D is too small.

In Order to Be Able to Directly See the Sun's