What is the approximate physical diameter in light-years in this problem?
A globular cluster of stars is measured to have an angular diameter of 20.6 arcseconds, and its distance from the Earth is measured to be 200,000 light-years.
A globular cluster of stars is measured to have an angular diameter of 20.6 arcseconds, and its distance from the Earth is measured to be 200,000 light-years.
1 Answer
Feb 25, 2016
19.97 ly, nearly.
Explanation:
20.6 arcsec = 7.722 E_03 deg = 0.9887 E=05 radian.
The cluster diameter is 200000X0.9887 E-05 light years
