Baby Professor - Cosmos, Earth and Mankind Astronomy for Kids Vol I | Astronomy & Space Science: Astronomy & Space Science

Cosmos, Earth and Mankind Astronomy for Kids Vol I Astronomy & Space Science

Speedy Publishing LLC E. Main St. #1156 Newark, DE 19711 www.speedypublishing.com Copyright 2016

All Rights reserved. No part of this book may be reproduced or used in any way or form or by any means whether electronic or mechanical, this means that you cannot record or photocopy any material ideas or tips that are provided in this book

Have you ever heard of the cosmos?

Cosmos comes from the Greek word kosmos, which means order and harmony.

In astronomy, it is the harmonious and orderly system of the entire universe.

Cosmology is the study of the origin of the entire universe as a whole.

It was Pythagoras who first applied the term cosmos in the 6th century B.C. He believed that the universe could be understood through whole numbers.

Pythagoras and his followers also believed that the Earth is spherical- shaped and is revolving around an unseen central fire together with the Sun and stars.

Who can define what cosmology is?

Cosmology is the study of the origin of the entire universe as a whole. Mankinds understanding of the universe changes as time passes and we learn more.

Earth was considered as the center of all things in the universe in the early history of Astronomy. It was also said that the planets and the stars were orbiting the Earth.

Nicolaus Copernicus, later in the 16th century, showed that all the planets in the solar system, including Earth, revolved around the Sun. He said the solar system was Heliocentric.

In the 17th century, Isaac Newton explained that the planets moved in elliptical orbits due to gravitational force, which is the same force that causes an apple to fall to the ground on Earth.

This theory explained Johannes Keplers laws of motion which are:

Planets revolve around the Sun on elliptical path (Law of Ellipses).

An imaginary line joining a planet and the Sun sweeps out equal areas in equal times (Law of Equal Areas).

The square of the orbital period of the planets is proportional to the cube of the distance of the Sun (Law of Harmonies).

At the start of the th century, Albert Einstein suggested his General Theory of Relativity.