GEO E111 Lecture 4: Geo_E_111_Class_-_4
Document Summary
A star is a heavenly possessing its own light which it transmits. The earth is in a galaxy called the milky way. It"s made of very hot gases mainly hydrogen (70%) and helium (30%). Surrounded by a layer of gas which has boiled from its surface which is called corona. Rotates on its own axis in anticlockwise direction. Has gravitational pull which holds all the planets in orbit around it. An orbit is a path which a planet or a satellite follows around a star or a planet. Temperature at its centre is 15m c and at the surface is 5500 c. Radiates solar energy which is very important for all forms of life on the earth. Planets are large spherical celestial/heavenly bodies in space. There are 9 planets in our solar system. Don"t have their own light but reflect it from the sun.
