Nebular Hypothesis

Nebular theory

The Nebular Hypothesis was put forward by Kant, the German philosopher in 1755 and Laplace, the French mathematician in 1796. This hypothesis suggests that the sun and planets including the Earth have formed from a disc shaped rotating nebula. A vast cloud of hot gas is called ”Nebula”. The Nebular Hypothesis may be summarized as …

Origin of the Earth

There are dozens of theories about the origin of the Earth. In general the theories of origin of the Solar System or earth can be divided into two groups: (i) Evolutionary theories (ii) Catastrophic Theories. Evolutionary Theories: The theories which suggest that planets are formed during the evolution of the sun, are called ”Evolutionary Theories“. …

Solar System

difference among the inner and outer panets.

The Earth is a planet. It is a member of the solar system. Nine planets and the sun are the main bodies of the ”Solar System”. The planets in the order of increasing distance from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Each planet moves around the sun and …

Satellites, Meteors, Constellations and Auroras.

Satellites: Satellite is a large body which revolves around a planet. The Solar System has 162 satellites. Out of these satellites, Jupiter has 63, Saturn has 56, Uranus has 27, Neptune has 13, Mars has 2 and Earth has one satellite(Moon). Major Satellites of Solar System are as under: Earth: Moon Mars: Phobos, Deimos. Neptune: …

Environmental Determinism and Possibilism:

Historical Background: It is the doctrine that human activities are controlled by environment. This belief has deep roots in ancient history. For example, Hippocrates linked the characteristics of people in a particular place to the influence of environmental factors such as terrain, altitude and humidity. Similarly Aristotle also said that the world’s climatic zones determined …