(b) The nearest star to the Sun is Proxima Centauri. This star has a mass of 2.5 x 1029kg and is a distance of 4.0 * 1013km from the Sun. The Sun has a mass of 2.0 x 1030kg. (i) State why Proxima Centauri may be assumed to be a point mass when viewed from the Sun. ..[1] (ii) Calculate 1. the gravitational field strength due to Proxima Centauri at a distance of 4.0 * 1013 km, field strength = . Nkg- [2] 2. the gravitational force of attraction between the Sun and Proxima Centauri. force = N [2]{a} Suggest quantitatively Why it may:r he assumed That The Sun is isolated in space from other stars