Early Earth, the Pale Orange Dot, May Have Been HabitableAn image of Saturn's moon Titan, which is surrounded by a thick haze. Scientists speculate that a similar haze surrounding early Earth may have helped to make it habitable. Source: NASA.
Before it became visible as the Pale Blue Dot, early Earth may have been aglow in orange, and this might have helped to make it habitable.
Scientists at the Virtual Planetary Laboratory, the NASA Astrobiology Institute (NAI) team based at the University of Washington, have developed a simulation of Earth during the Archaen era (3.8-2.5 billion years ago), with the atmosphere supporting an organic-rich and orange-colored haze that—shifting from previous haze studies— provided UV and temperature shielding to support the existence of life.
The paper, “The Pale Orange Dot: The Spectrum and Habitability of Hazy Archaen Earth,” was published in Astrobiology.
This Earth model builds on previous studies that speculate on the existence of an orange haze, but introduces the factors of climate, photochemistry, and fractal hazes. By better understanding Archaen Earth, scientists hope to increase their understanding of similarly hazy exoplanets and their potential habitability. “The Pale Orange Dot” was presented at the Annual Meeting of the Division of Planetary Sciences conference in November 2015, with a news release available from the University of Washington.
- NASA Missions Provide New Insights into 'Ocean Worlds' in Our Solar System
- NASA New Frontiers Program AO Released
- Opportunities and Obstacles for Life on Proxima B
- Implications of the Discovery of Proxima b
- Early Career Astrobiologist Profile: Lupita Tovar Reaches for the Stars — and Exoplanets
- Astrobiology at Chicago's Field Museum
- Kepler & K2 Science Conference (June 19-23, 2017)
- Female of the Species Podcast
- How Hot Were the Oceans When Life First Evolved?
- AbGradCon 2017 Live Webcast