Answer to Question #182995 in Geography for Reena reena thakur

Question

Q1. What are Planets?

Q2. Explain about the History of the Planets?

Answer 1

Q1. Planets are celestial bodies that orbit around the sun and massive enough to be rounded by their own gravity.

Q2. About five billion years ago, a giant cloud called nebula made of dust, gas helium, hydrogen and small amount of atoms floated in one spiral arms of the galaxy. This cloud started to contract collapsing on itself. The atoms that separated began to jostle each other generating heat, they reached a temperature where protons at the center began to fuse together causing a tiny bit of matter to transform into a lot of energy and the sun was born.

The material in the nebula not absorbed into the sun swirled around into a flat disk of dust and gas held in orbit by the sun's gravity beginning the formation of planets. The atoms and molecules began to stick together into large particles. In gentle collisions, the dust build into balls, combining and growing. Over a period of time, worlds collided, combined and evolved and when it ended there were eight stable planets that orbit around the world and are massive enough to be rounded by their own gravity.