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The first equation we get into our mind when talking about physics is "E=mc2 ".and the newtons law(newton's three laws of gravity).these were days when talking about these made us feel "super genius".At least among our friend's circle .As the days have changed, we aware of learning something new everyday.These are many phases of excitement we went through and every new discovery made a very interesting topic to discuss.Recently ,the string theory evolved in the M.theory. Now ,lets get from the basics.

• what is string theory?
• what is its use?
• Is there any other theory opposite of string theory?
• what is M.theory?
• what's the improvement /what's new ?

early days, we used have two theories to describe the motion of particles."theory of reletivity describes the motion of large objects while "Quantum mechanics" describes how the Quantum particles  behave (like neutron,proton). But there is no relation between these two theories.
we know that matter is made of atoms.these are further divided into neutrons,protons and electrons which revolve around the nucleus(neutrons,protons).There are one fundamental particles while protons and neutrons are made up of similar particles like quarks.

If  these particles behave differently,so we need different theories to solve the problems.so these particles are like having different kind of materials in the wall.so its not possible,so get a relation between large objects and quantum particles so, string theory gives the relation between them.
String theory is an theoretical framework in which point like particles are replaced by the strings. These strings are objects and describes the propagation in space interaction with each other.
here matter is considered as string instead of particles in the quantum mechanics and also tells the existence of big bang and parallel universe to explain this,let us assume that some insects are trap onto a soap bubble and is expanding in all directions,here  we are considered as insects and space is soap bubble which is expanding continuously.

Now question arises, how is universe formed ?
   On a soap is  bubble is formed, similer to that universe is formed by the collision.for example our near by galaxy is moving rapidly towards milky way galaxy,which may collide in 4 billionary  year .The Einsteins law  do not apply in the center of the black hole,so string theory comes to existence. This theory gives the proof for the existence to the big bang.
Lets now now consider two points  on paper. If we join them, we get  the distance between them, but when we told the paper to half, then it makes a complete sense to time travel  and formed is a wormhole. So string theory gives   the project concept of time travel many scientists are like Stephen hoking  to explain whether such conditions can exist or not ,so string theory is only game in town which gives most of the answers.


M.THEORY:
After string theory, there were many theories  raised to get the answers of left unanswered by the string theory.Some of the Einstein's laws do not verify in the dimensions,so,when we expand the dimensions say 11,kaboom problem  solved ,every question gets answered,but over  its not possible .In M.theory every we take it as "membrane" some of theories combine to form the M.THEORY.So,every particle here is considered as a membrane instead a string or particle.so, in the future ,aliens  not be any creature from other planet,it might be us from a different dimensions.The days were gone when scientists used to believe there is a single universe,now they all believe in one thing "THE MULTI Verse" .