Web at 4.5 billion years old, it can be difficult to understand just how old earth is, and the changes that have taken place on the planet in all that time.

Birth of earth. Planetary scientist robin canup has modelled the. Earth formed as part of the birth of the solar system. It has evolved into our home,.

Web when earth first formed it had barely any atmosphere. Web it is the densest planet in the solar system. Dr iain stewart explains how the earth developed its inner heat during a time known as the.

Web the earth's birth. Web it explores some of the greatest questions in science today: All of the planets, except for earth, were named after greek and roman gods and.

Caltech uncovers new details of earth’s formation. Of the four rocky planets, it is the largest and most massive. How did earth become a living planet?

Earth is about eight light. Web birth of our planet: What does its history tell us about our chances of.

Web early in its life, the earth collided with another planet. Its atmosphere began to form as the planet started to cool. A study from caltech revealed that the early.