JasonN


 * The theory of relativity came from two physicists** **Galileo** **and Einstein.** **Galileo introduced his ideas in 1632.** **Einstein published his first theory of relativity, the special theory of relativity, in 1905 and** **his second theory, the general theory of relativity in 1915. Einstein's theories explain the behavior of matter, energy, and even time and space. In developing his theories, Einstein used ideas from a principle of relativity developed by Galileo known as** **Galilean relativity****.**


 * Galileo** **presented the main idea behind Galilean relativity by describing undetectable motion. He gave examples using two people, a ships cabin, butterflies, small flying animals, fish swimming in a bowl, drops of water falling from one container to another, and a ball. Everything is below deck and no one can see outside.**


 * In the first example, Galileo said that if you are below deck on a ship on the water, and passing a ball to someone, you can't tell if the ship is moving or not because the speed of the ball doesn't change. Another example is if the ship is moving on the water and you are below deck with a bowl of fish you can't tell if the ship is moving or not because the motion of the fish didn't change. Lastly, if birds are flying around in the cabin of a ship, it doesn't matter if the ship is moving or not, the motion won't change**. **In conclusion both Einstein and** **Galileo explained their ideas on the theory of relativity by giving examples of** **the behaviors of energy, matter, time and space through** **undetectable motion.**

Dine, Michael. "NASA - Relativity." __NASA - Home__. 5 Feb. 2009 .