Earth’s Atmosphere Got Its Oxygen in Periodic Bursts Over a 100 Million Year Period
For about the first 2.1 billion years of Earth’s history, its atmosphere didn’t have enough oxygen to support complex life. Scientists believe that Earth’s first atmosphere,formed after its creation, was probably made up of hydrogen and helium. Then as a result of volcanic eruptions that spewed gases from Earth’s interior, in a process known as […]
Mars Once Abundant With Water
Past observations made by a number of Mars probes, such as the Curiosity rover and the Mars Reconnaissance Orbiter, have suggested that Mars once had an abundance of water flowing over its surface. Now, an international team of scientists say their recent research suggests that an ancient ocean that held more water than Earth’s Arctic […]