(The string is extremely tiny, at the Planck length of 10 ^-33 cm, a billion billion times smaller than a proton, so all subatomic particles appear pointlike.) If we were to pluck this string, the vibration would change; the electron might turn into a neutrino. Pluck it again and it might turn into a quark. In fact, if you plucked it hard enough, it could turn into any of the known subatomic particles. Strings can interact by splitting and rejoining, thus creating the interactions we see among electrons and protons in atoms. In this way, through string theory, we can reproduce all the laws of atomic and nuclear physics. The "melodies" that can be written on strings correspond to the laws of chemistry. The universe can now be viewed as a vast symphony of strings. . Michio Kaku
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The Universe, our Sun and the planets are made up of atoms which are made up of protons, neutrons and electrons. These particles are very tiny and can't be seen with the naked eye so they are known as subatomic particles. Protons, neutrons and electrons are made up of even smaller subatomic particles called quarks. The beauty of this theory is that it doesn't only explain the basic laws of physics but also how stars and planets were formed and how they interact with each other.

Source: Parallel Worlds: A Journey Through Creation, Higher Dimensions, And The Future Of The Cosmos

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