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Habitability

Could Life Survive on Frigid Exo-Earths? Maybe Under Ice Sheets

Our understanding of habitability relies entirely on the availability of liquid water. All life on Earth needs it,...

What’s the Best Mix of Oceans to Land for a Habitable Planet?

Earth is about 29% land and 71% oceans. How significant is that mix for habitability? What does it...

Curiosity Arrives in a Salty Region of Mars. Was it Left Over From a Dying Sea?

The Curiosity rover has now reached its primary target on Mount Sharp on Mars, the mountain in the middle...

If Earth Were an Exoplanet, it Would Still be Tricky to Figure Out if There’s Life Here

How would Earth appear to alien astronomers? What would their observations tell them about Earth if they were searching...

Water Worlds Could Have Plumes of Nutrients Carried up From Down Below

Earth’s oceans are one huge, uniform electrolyte solution. They contain salt (sodium chloride) and other nutrients like magnesium,...

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