How would the motion of the planets in the solar system change if the mass of the Sun were suddenly halved?

All the planets would scatter, since the real speed of each of them is exactly equal to that which, at the corresponding distance, with a decrease in the mass of the Sun, would become a parabolic speed.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.