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First Ring System Around Asteroid
Topic: Meteorites, Comets and Asteroids
Summary: Scientists have discovered that the remote asteroid Chariklo is surrounded by two dense and narrow rings. The origin of these rings remains a mystery, but they may be the result of a collision that created a disc of debris.

A New Structure in Earth's Radiation Belt
Topic: Spaceship Earth
Summary: Physicists have discovered a structure in Earth's inner radiation belt that could pose a threat to future human explorers and communication satellites.

Large Predators Roamed Oceans Soon after Permian Extinction
Topic: Biosphere
Summary: A new study shows that large predators roamed the oceans soon after the End-Permian extinction--suggesting that ecosystems recovered more rapidly than previously thought.

Unlocking Darwin's 'Mystery of Mysteries'
Topic: Origin & Evolution of Life
Summary: Hybrid incompatibility -- failure of 2 closely related species to produce offspring that survive and reproduce -- has puzzled scientists beginning with Charles Darwin.

Global Warming May Increase Methane Emissions from Freshwater Ecosystems
Topic: Climate
Summary: New research suggests that rising global temperatures will increase the quantity of methane emitted from freshwater ecosystems to the Earth's atmosphere - which could in turn lead to further warming.

A Hypothesis for Continued Habitability on Earth
Topic: Geology
Summary: Throughout Earth's history, geological cycles may have acted to provide a balance of hot and cold that has helped maintain our planet's habitability.

Ancient Food Webs Show Modern Structure after Mass Extinction
Topic: Biosphere
Summary: A new study reveals that an ancient food web was organized much like modern food webs--despite the 48 million years of evolution that separate them.

Solar System's Edge Redefined
Topic: Outer Solar System
Summary: Astronomers have extended the edge of the known Solar System by spotting a new dwarf planet. The finding also indicates the possible presence of a giant planet somewhere in the dark, cold region of space far from the Sun.

Mercury’s Contraction Much Greater Than Thought
Topic: Mercury
Summary: New data show that the innermost planet has contracted far more than previously thought. The findings are key to understanding the planet's history and the structure of its unusually large metallic core.

Understanding How Mountains and Rivers Make Life Possible
Topic: Geology
Summary: A new study describes how features of a landscape affect our Earth's carbon cycle.

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