The International Space Federation constructs a new spaceship that can travel at a speed of 0.995c. Mary boards the spaceship totravel to Barnard's star which is 5.98 ly away. After reachingBarnard's star, the spaceship travels slowly around the star systemfor 3 years before returning back to Earth.
a) How much time does her journey take?
b) How much older is her twin Frank when she returns?