Advantages

Merits of using this propulsion system

•  Efficient as 100 percent of mass of matter and antimatter is converted into energy

•  Produces a large amount of energy that is about 1000 times nuclear fission energy and about 300 times more than nuclear fusion energy

•  It would allow the spacecrafts to reach the nearby stars and solar system in a fraction of time that is required by space shuttles using hydrogen-oxygen fuel

•  Fuel required will be less as energy produced per gram increases

Demerit

-Lack of antimatter substance existing in the universe.

Tether technology is the last propulsion technique we are going to study.