What Are The Threats To Earth From Space‪?‬

Chapter 1. - We know that the Big Bang of 13 billion years ago saw the birth of the sun and many other planets. The Big Bang and historical evidence of the sun from Newgrange to Maeshowe. What powers the Sun?
Chapter 2. - The sun which is 90 million miles away from the earth is our own star. The sun’s corona, eclipse, the sun’s core and makeup. Solar weather. Sunspots, solar maximum and solar minimum.
Chapter 3. - On 15th February 2013, people on their way to work in Chelyabinsk, Russia were to witness an event that happens every fifty to one hundred years. Asteroids, meteorites Chelyabinsk. Chebarkul meteorite. The Yarkovsky Effect. The Tunguska Event, eyewitness testimony. The Yucatan Peninsula meteorite or comet? Comets and their components.