Stars: What Is the Parallax Angle for Proxima Centauri, Which

Multiple Choice

Stars: What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly? Earth's orbit around the sun has a mean radius of 1.5 × 10⁸ km, and 1 ly = 9.461 × 10¹⁵ m.

A) 1.2 × 10^-14 degree
B) 2.1 × 10^-4 degree
C) 1.2 × 10^-7 degree
D) 2.1 × 10^-7 degree
E) 2.1 × 10^-14 degree