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Twin Paradox

Hey there, 
It's been long I haven't written anything but today I chose to pen-down something very close to my heart, the twin paradox. It was taught to us in 1st semester in physics under the topic special theory of relativity. The story is as under.. 
There were two twins A and B. They celebrated their birthday on same date every year. But on their 18th birthday A went for a space trip to rotate around a celestial object with a speed nearly 80% of light. He told his brother B that he would come back next year on their birthday when they would be celebrating their 19th birthday. He went for the trip with speed of 0.8c to space and took exactly 1year to return on earth. As he returned he found his brother B was 80 years old. Why this paradox took place? It's because earth revolved 62 years during this time as compared to A's spaceship which took only one year as it was travelling at very high speed. This is a time travel which can occur according to special theory of relativity. But actually this should not be considered paradox as frame of references are different. 
Cheers.. 

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