Question

what is termination shock and heliopause in solar system

Answer 1

The zone between the termination shock and the heliopause is known as the heliosheath. The termination shock is the boundary marking one of the outer limits of the Sun's influence, and is one boundary of the solar system.

Answer 2

The heliosphere is the bubble-like region of space dominated by the Sun , which extends far beyond the orbit of Pluto . Plasma "blown" out from the Sun, known as the solar wind , creates and maintains this bubble against the outside pressure of the interstellar medium, the hydrogen and helium gas that permeates the Milky Way Galaxy. The solar wind flows outward from the Sun until encountering the termination shock , where motion slows abruptly. The Voyager spacecraft have explored the outer reaches of the heliosphere, passing through the shock and entering the heliosheath , a transitional region which is in turn bounded by the outermost edge of the heliosphere, called the heliopause. The shape of the heliosphere is controlled by the interstellar medium through which it is traveling, as well as the Sun and is not perfectly spherical. The limited data available and unexplored nature of these structures have resulted in many theories. The word "heliosphere" is said to have been coined by Alexander J. Dessler , who is credited with first use of the word in the scientific literature.

Source : wikipedia