Our Cosmic Backyard: The Inner Planets

Our Solar System was formed 4.5 billion years ago when gravity pulled interstellar gas and dust together. The intense gravitational force on these particles caused an explosion of nuclear fusion, resulting in the formation of a star, our Sun.

Our Sun was the first resident of our Solar System. The newly formed star began to blow stellar winds to help clean up the leftover debris of gas, dust and rock. This stellar wind also helped the star from collapsing under its own gravity. The Sun was now fully functional and was ready for company – Planets. Continue reading