In order for a solar sail spacecraft to be accelerated to speeds high enough to accomplish interstellar travel in a reasonable amount of time, it would need to be started
A) from a lunar orbit where the gravity is weaker
B) close to Earth using mirrors on the surface to reflect sunlight onto the sails
C) far from the Sun so Jupiter could be used to help it on its way using a gravitational assist
D) close to the Sun where the radiation pressure is higher

Question

Quizplus · Accepted Answer

Solar sails work by reflecting sunlight to gain momentum. Being closer to the Sun increases the intensity of sunlight and thus the radiation pressure exerted on the sails, allowing for greater acceleration. This principle is more effective than starting from locations with weaker gravity or using planetary assists for the initial acceleration phase in the context of utilizing solar radiation pressure.

In Order for a Solar Sail Spacecraft to Be Accelerated