Tag Archive for 'Paleozoic Oxygenation Event'

An artist’s impression of a terraformed Mars. Image credit: Daein Ballard / CC BY-SA 3.0.

High-Oxygen Exoplanetary Atmospheres More Common than Thought, Study Suggests

Dec 30, 2019 by The Conversation

The existence of habitable alien worlds has been a mainstay of popular culture for more than a century. In the 19th century, astronomers believed that...