Planets do not take much longer to form after stars have formed. For example, the Sun formed 4.6 billion years ago, and the Earth about 4.5 billion years ago. However, scientists now say it is not necessarily the only possibility. ...
What the Rise of Oxygen on Early Earth Tells us about Life on other Planets, and How it Have Evolved
Deeper knowledge of Earth’s atmosphere could help us find signs of life outside of our solar system. How did the Earth have enough oxygen to support animal life? In a study by McGill University, they found that oxygen levels rose ...