The Origin and Evolution of Earth Flashcards
When was the Big Bang
13.7 Billion years ago
What happened 300,000 years after the primordial atom exploded
The temperature dropped to 4500 Kelvin
Who was Immaneul Kant ?
German philosopher who gave the nebular hypothesis in 1755
Who was Laplace?
A mathematician who revised the nebular hypothesis in 1796
When was the Planetesimal hypothesis introduced?
In 1905
Who introduced Planetesimal hypothesis?
Chamberlain and Moulton
Who supported the planetesimal theory
Sir James Jeans and Sir Harold Jeffery
Who revised the nebular hypothesis again?
Otto Schmidt in Russia and Carl Wiescar in Germany revised nebular hypothesis in 1950
When did Edwin Hubble provide proof for the Big Bang
1920
What are the two theories of how the universe is?
The big bang theory which is widely accepted and Hoyle’s concept of a steady state which is not very widely accepted
What is Hoyle’s concept of a steady state?
That the universe is same at every point of time
What is the diameter of individual galaxy ?
80,000-150,000 light years
When were the stars formed
5-6 Billion years ago
What is a light year ?
The distance that light travels in a year is called a light year, it is a unit used to measure distance between two or more galaxies.
What is the speed of light?
300,000 km/second
