The Star Formation
In the early universe, matter and energy were distributed unevenly, leading to variations in gravitational forces. These differences caused matter to be drawn together, laying the groundwork for the formation of galaxies. Galaxies, each containing numerous stars, span vast distances measured in thousands of light-years. Individual galaxies typically have diameters ranging from 80,000 to 150,000 light-years.
Galaxies begin to form when hydrogen gas accumulates in the form of large clouds called nebulae. Over time, these nebulae develop localized clumps of gas that gradually grow denser, eventually leading to the formation of stars. This process of star formation is estimated to have occurred around 5-6 billion years ago.
A light year is a unit of distance, not time, representing the distance light travels in one year at a speed of 300,000 kilometers per second. For example, the mean distance between the sun and the earth is approximately 149,598,000 kilometers, which translates to approximately 8.311 minutes in terms of light-years.
Origin of the Earth: Modern Theories Class 11 Notes
The formation of the Earth is a long-standing mystery that has captivated scientists for centuries. Modern theories propose that our planet was born from a vast cloud of gas and dust, known as the solar nebula, which also gave rise to the Sun and other planets in our solar system. These theories provide insights into the processes that shaped the Earth’s early history and continue to influence our understanding of planetary formation.
Let us discuss the origin of Earth from modern theories’ perspective:
Origin of the Earth: Modern Theories Class 11 Notes
Contact Us