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Oxygen's Watery Past
Topic: Earth
Summary: Prior to the 'Great Oxidation Event', when Earth's atmosphere became rich in oxygen, reserves of the gas may have been stored in the oceans. The evidence of 'oxygen oases' in the oceans can be seen in tiny aerobic organisms that evolved to survive on extremely low levels of oxygen in these undersea habitats.

It's a Small World After All
Topic: Earth
Summary: Using measurements from space, scientists have confirmed that, although the surface of the Earth is constantly changing, the planet is not expanding.

Ancient Tides Higher Than Today
Topic: Earth
Summary: New research shows how the Earth's tides have changed dramatically over thousands of years - and may change again in the future.

Living Dangerously
Topic: Earth
Summary: 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.

What Keeps the Earth Cooking?
Topic: Earth
Summary: New research is helping scientists understand fundamental properties of the Earth, such as the spread of sea floors and melting of the outer core.

Earth's Core is Melting and Freezing
Topic: Earth
Summary: New research shows that the Earth's core is simultaneously melting and freezing due to the circulation of heat in our planet's mantle.

Methane Misses Marinoan by Millions of Years
Topic: Earth
Summary: A new study is causing scientists to re-think the events that led to the end of a 'Snowball Earth' ice age some 600 million years ago.

Earth's Past, Made Visible
Topic: Earth
Summary: New visualizations of the Earth from space provide a unique image of how the Earth has changed over the past 750 million years.

Earth's Gravity Revealed
Topic: Earth
Summary: Observations from ESA's GOCE satellite have provided the best ever map of Earth's gravity. The research could further our understanding of the Earth.

A 'Supermoon' Did Not Cause the Japanese Earthquake
Topic: Earth
Summary: Scientists agree, in no uncertain terms, that the Moon did not cause the earthquake in Japan. Understanding the causes and effects of earthquakes is important for astrobiologists who are trying to determine how events on Earth will shape life's future on our planet.

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