GEO E111 Lecture Notes - Lecture 3: Collision Theory, List Of Nearest Stars And Brown Dwarfs, Solar System
Document Summary
Solar system is the group of heavenly bodies comprising the sun and the nine planets. A theory is a set of reasoned ideas intended to explain facts or events: passing star theory. A star with a greater gravitational pull passed near the sun. It attracted large quantities of gaseous materials from the sun. The materials split, cooled and condensed to form planets. The planets were set in orbit by the passing star. Doesn"t explain the origin of the sun and star. Materials would disperse than condense: collision theory. Star with greater gravitational pull passed near the sun. Large portions collided with smaller ones and swept them to form planets. The weaknesses are the same as the passing star"s theory: nebula clod theory. There was a slowly rotating cloud of dust and gas called nebula. Rotation speed increased and successive rings of gaseous materials were formed. The central gaseous material remained as the sun.
