Essays on String Theory

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Introduction

In the last few centuries, our understanding of universe has grown by leaps and bounds. Before seventeenth century, people generally believed that the Earth is at centre of the universe and all heavenly bodies move around the Earth. Galileo challenged the idea and published his papers in support of Copernican heliocentric theory that the Earth and other planets move around the Sun. Our understanding of universe grew further. We realized that the Sun is not unique and there are hundreds of billions of stars in the galaxy, which are brighter ...

The cosmos is a vast super structure consisting of planets, stars, contents of intergalactic space, subatomic particles, matter and energy. It is approximately forty six billion light years in radius. The universe was formed 13 billion years ago, when the Planck epoch expanded causing the Big Bang explosion. It is governed by laws and constants that determine the position and the interactions of objects in the universe. Cosmologists argue that the universe has been expanding since its formation. The Big Bang model of the universe, the universe will begin to crumble in the phase, scientists refer to as the Big ...

In Pedagogy of the Oppressed, Freire outlines his concept of banking education: the notion that, ‘knowledge is a gift bestowed by those (teachers) who consider themselves knowledgeable upon those (students) whom they consider to know nothing. (2014, p.2) To Freire, banking education is problematic as it, ‘negates education as a process of enquiry,’ (2014, p.2) through the assumption that each student is completely ignorant. He asserts that: ‘Education must begin with the solution of the teacher-student contradiction, by reconciling the poles of the contradiction so that both are simultaneously teachers and students’ (Freire, 2014, p. 3) In the following essay I ...

Gravity is precisely defined as a pulling force; it pulls objects (matter) towards it. The intensity of force is directly proportional to the quantity of matter, so the things composed of more matter tend to be pulled with greater intensity of force. The mass of any object is the fundamental unit being used to measure the quantity of matter it that object. Therefore, the more heavy and matter in the object is, the higher gravitational pull will it put forth. Earth exerts a pulling force on the objects (Human beings) that move on its surface and as a result it pulls them ...