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
What is the distance between sun and the earth
149,598,000 km
What is the distance between the sun and the earth in terms of light years?
8.311 minutes
When were the planets formed?
4.6 billion years ago
What is accretion?
Accumulation on top of one another
What is degassing?
Pouring of water vapours and other gases from the surface of earth
What is differentiation?
The sinking of heavy materials to the centre of the earth and the the floating of lighter matter to the surface of the earth
Name the two dwarf planets
Pluto and 2003 UB 313
Two theories of the formation of moon
Dumb-bell hypothesis and the big splat
Who gave the dumb-bell theory
Sir george darwin in 1838
How old are the oceans
4 Billion years old
When did life begin
3.8 Billion years ago
When was the process of photosynthesis evolved ?
2.5 - 3 Billion years ago
When were the oceans saturated with oxygen ?
2 Billion years ago
How many planets and moons are present in the solar system
1 sun, 8 planets and 63 moons
When did the first atom begin to form
Within the first 3 minutes of Big bang
