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Comet ISON Defies Expectations
Topic: Meteorites, Comets and Asteroids
Summary: When Comet C/2012 S1 ISON rounded the Sun last week, it provided many spectacular surprises for scientists and amateur astronomers alike.

Iron Both Hides and Preserves Fossils
Topic: Origin & Evolution of Life
Summary: A new study shows how iron may help preserve ancient dinosaur tissue inside fossils. However, the iron could also make tissues difficult to detect.

Habitable Planet Search Should be More Conservative
Topic: Alien Life
Summary: A new study indicates that astronomers may have to be more conservative when determining the habitable zones of planet-hosting stars.

A Solar System Similar to Ours, but More Compact
Topic: Cosmic Evolution
Summary: Astronomers have found the closest match to our own solar system yet known.

Which Ancient Minerals Helped Give Rise to Life?
Topic: Geology
Summary: A new study challenges the idea that mineral species on Earth today are much the same as they were billions of years ago when life first arose on our planet.

MESSENGER Captures Images of Comets Encke and ISON
Topic: Meteorites, Comets and Asteroids
Summary: In a showcase of opportunistic science, NASA's MESSENGER spacecraft at Mercury has captured images of the comets ISON and Encke.

Unusual Greenhouse Gases May Have Raised Ancient Mars Temperature
Topic: Mars
Summary: Scientist modeling the early atmosphere of Mars have shown that the right balance of carbon dioxide, hydrogen and water could have made Mars warm enough for liquid water to persist at the surface.

New Models Aid the Search for Earth-like Planets
Topic: New Planets
Summary: New theoretical models could make the search for habitable planets easier.

Acid Rain, Ozone Depletion & the Permian Extinction
Topic: Earth
Summary: A new study shows that massive volcanic eruptions and acidic rain could have played a role in the Great Dying - the largest mass extinction yet known in Earth's history.

Evidence Found for Granite on Mars
Topic: Mars
Summary: A new study shows that Mars may be more geologically complex than previously believed.

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