Origin and Evolution of the Earth

Question 1

Facts about Nebular Hypothesis

Answer 1

1. Given by Immanuel Kant and revised by Laplace
2. Modified by Schmidt and Weizascar

Question 2

Facts about Wandering Star Hypothesis

Answer 2

1. Given by Chamberlain and Moulton
2. Supported by James and Harold

Question 3

Facts about Big Bang Theory

Answer 3

1. Proposed by Georges Lemaitre
2. AKA Expanding Universe Hypothesis
3. Energy → Matter and Dark Matter (i.e. missing mass of universe after 2 seconds of Big Bang)
4. Evidence of expanding universe: Edwin Hubble

Question 4

Descending order of density of Planets

Answer 4

EMVMJSUN [1st M is Mercury]

Question 5

Descending order of size of Planets

Answer 5

JSUNEVMM [Mercury at the End]

Question 6

Atmosphere thickness comparison among the two groups of planets

Answer 6

Jovian Planets > Terrestrial Planets

Reason: Gravity of Jovian Planets ↑ → Capability to hold escaping gasses ↑

Question 7

Earth’s atmosphere and its constituents over all the three stages

Answer 7

Stage - 1: H2 and He [Blew off by solar winds]
Stage - 2: Water Vapor, CO2, CH4, NH3, O2 [Degassing occurred]
Stage - 3: Present (N2 (78%) and O2 (21%))

Question 8

Facts about Sun

Answer 8

1. Composition: 92% (H2) and 7.8% (He) and other dust
2. 6 - Layers: CRCPCC
   Core, Radiative, Convective, Photosphere, Chromosphere, Corona