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Breathing Life into the Ocean
Topic: Earth
A new study challenges the notion that a well-oxygenated atmosphere must pre-date a well-oxygenated ocean.

How Did Early Earth Protect Itself Against The Cold?
Topic: Earth
Early Earth appears to have had some kind of cold shelter against the weak young Sun, but how exactly did the atmosphere protect the planet?

What Astrobiology Teaches Us About Living Well on Earth
Topic: Earth
Astrobiology's study of life in the universe has much to say about how humans can live sustainably on Earth.

The Longevity of Human Civilizations
Topic: Earth
How long can civilization last? That question has long been asked by astronomers searching for intelligent alien life, and recently was the focus of a symposium in the Library of Congress.

Improving Understanding of Snowball Earth
Topic: Earth
From a solid icy Earth to a slushy planet, scientists’ understanding of the most dramatic ice ages have evolved over two decades.

Swansong Biospheres
Topic: Earth
Billions of years from now, life on Earth will be extinguished when the Sun becomes a Red Giant star. New research determines the last places life will exist before our planet is sterilized.

Living Dangerously
Topic: Earth
In an exclusive podcast for, Dr. David Grinspoon, astrobiology curator at the Denver Museum of Nature & Science, discusses our violent Earth. He explains why earthquakes, severe weather, and other aspects of the dynamic environment may be necessary for life to exist.

How Earth´s Orbital Shift Shaped the Sahara
Topic: Earth
A change in the Earth´s orbit, many scientists believe, transformed the "Green Sahara" into what is now the largest desert on the planet. While scientists are still trying to find out if the slow shift in orbit had rapid or gradual environmental consequences, they say Earth´s orbit will continue to change today and into the future.

Thawing a Planet-Sized Snowball
Topic: Earth
The Earth has plunged into a deep freeze several times in the past, with ice covering the land and sea for millions of years. Researchers are studying how the planet eventually escaped these cold spells, and whether Earth-like planets elsewhere in the galaxy may be susceptible to the same climate catastrophe.

A Hazy View of Early Earth
Topic: Earth
The atmosphere of the early Earth may have been filled with particulate haze, much like a smoggy day in Los Angeles. This hazy air would have affected the ancient climate and even may have influenced the origin and evolution of life.
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