THE EARTH AND THE SOLAR SYSTEM - KCSE GEOGRAPHY NOTES, AUDIOVISUALS, Q & A, OTHER RESOURCES
The Earth and the Solar System TOPIC OBJECTIVES
By the end of the topic, the learner should be able to:
The Earth and the Solar System COURSE OUTLINE
The Earth and the Solar System
Solar system is the group of heavenly bodies comprising the sun and the nine planets.
The origin of the Solar System
A theory is a set of reasoned ideas intended to explain facts or events
1. Passing Star Theory
A star with a greater gravitational pull passed near the sun, it attracted large quantities of gaseous materials from the sun, and the materials split, cooled and condensed to form planets, the planets were set in orbit by the passing star
There was a slowly rotating cloud of dust and gas called Nebula, As the nebula rotated it flattened into a disc with high concentration of materials at the centre, The high concentration of material at the centre condensed to form the sun. Gases such as ammonia and methane condense to form larger planets that is Jupiter, Saturn, uranius and Neptune. Closer to the centre of Nebula, particles of dust and gas bumping into each other formed the inner smaller planets.
Rotation and revolution of planets in anticlockwise direction
Star with greater gravitational pull passed near the sun. It attracted large quantities of gaseous materials. The materials split into portions. Large portions collided with smaller ones and swept them to form planets. The weaknesses are the same as the passing star’s Theory.
4. Supernova/explosion Theory
There was a violent explosion of a star. A cloud of dust (nebular) remained from the star. There was fast movement of the cloud due to the force of explosion. Rotation speed increased due to gravitational attraction. The cloud flattened into a disc. The matter began to accumulate towards the centre to form a proto-sun which later began to shine. The rest of the cloud collapsed to form planets.
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LATEST KCSE & KCPE PAST PAPERS
Composition of the Solar System
1. The Sun
It’s the centre of the universe.
Planets are large spherical celestial/heavenly bodies in space.
There are 9 planets in our solar system.
"I like science fiction and physics, things like that. Planets being sucked into black holes, and the various vortexes that create possibility, and what happens on the other side of the black hole. To me it's the microcosmic study of the macrocosmic universe in man, and that's why I'm attracted to it." ~Wesley Snipes
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