Final answer:
Yes, it is true that a solar sail craft can be propelled using just particles within the solar wind, which exert pressure and can accelerate the craft over time.
Step-by-step explanation:
The question you've asked pertains to whether a solar sail craft can be propelled using just particles within the solar wind. The answer is true. The principle behind solar sailing is that light and particles emitted by the sun, known as the solar wind, exert pressure upon the sails of a spacecraft. Even though the force is small, it is continuous and can build up over time, allowing a solar sail craft to gain significant speed without the need for fuel. Over time, this propulsive method can theoretically bring the craft to high velocities, making it a viable method of propulsion for long-duration space missions.