In 1965, a computer engineer called Gordon Moore said, ‘The number of items in a computer chip will double every year.’ In other words, chips will become more and more powerful while, at the same time, becoming smaller and smaller. Ten years later, he changed the doubling time (21)___________ every four years. For the next 45 years, his idea proved to be correct, so people now call it Moore’s Law. Although some people say the speed of change (22)___________ lower now, as a result of Moore’s Law, the power of modern computers is unbelievable. One example will show this.
 
Apollo 11 was the American spacecraft (23)___________ took astronauts to the Moon and back in 1969. It is clear that the computer on this spacecraft (24)___________ able to do a lot of very difficult things. However, it had a lot less power than your present smartphone! Your phone has at least one million times more RAM than the spacecraft had. It also works at a speed which is 100,000 times (25)___________ than Apollo 11’s computer. 
 
So if you can find someone to program your phone for a trip to the Moon and back, all you will need to make the trip then is a spacecraft! 

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