Electric train can travel as fast as 110 miles an hour. If a railway could be built on a sunbeam, it would take the train nearly 100 years to reach the sun. You would get very, very tired even if you lived long enough to finish the journey. The aircraft carrier is one of the fastest warships, having a speed of about 40 miles per hour. If the ship could sail through space, it would take more than 200 years for her to get to the sun. A little over 200 years ago America won her independence from Britain. Suppose someone had set off to the sun in this ship when George Washington became President of the United States. Now after traveling all these years, he would still have a long journey before him. Suppose you lived with your parents in New York and you wanted to visit your grandmother in Philadelphia.