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We summarize the week's scientific breakthroughs every Thursday.

  1. Cosmology

    Dark energy search gets murkier

    Supernova measurements muddle scientists’ efforts to explain universe’s accelerating expansion.

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  2. Cosmology

    Candidates for dark matter particles bite the dust

    Most sensitive experiment yet determines that earlier findings were just artifacts.

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  3. Astronomy

    An Earth-sized hell circles faraway star

    Kepler-78b, an Earth-sized, extremely hot exoplanet made of rock and iron, is the smallest with known diameter and mass.

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  4. Astronomy

    Solar system with seven planets discovered

    Kepler data has identified a star with a seven-planet system structured similarly to the sun’s clutch of planets.

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  5. Cosmology

    My Brief History

    by Stephen Hawking.

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  6. Astronomy

    Oort cloud tosses astronomers a cometary curveball

    In late November, ISON will deliver debris from the dawn of the solar system to Earth’s doorstep.

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  7. Astronomy

    Most distant galaxy discovered

    Astronomers have observed a galaxy as it existed 700 million years after Big Bang.

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  8. Astronomy

    Milky Way flutters as it spins

    Galaxy has added motion along its north-south axis.

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  9. Planetary Science

    Carbonation may have grounded Mars’ atmosphere

    The chemical interaction could have forced Red Planet’s atmospheric carbon dioxide into the dirt.

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  10. Environment

    Feedback

    Readers respond to "Solving soot," trade-offs of horn size for male Soay sheep and the huge galactic explosion story from 50 years ago.

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  11. Planetary Science

    A grander canyon on Mars

    Hebes Chasma, a huge trough on Mars, reflects the Red Planet’s tumultuous and varied past.

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  12. Astronomy

    Quiet maximum

    By almost any measure, this solar maximum has been pathetic. No more than 67 sunspots have appeared in a month so far; at the last peak, in 2000, that number was above 120.

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