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We summarize the week's scientific breakthroughs every Thursday.

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  1. Cosmology

    New data fuel debate on universe’s expansion rate

    Quasar observations add to discrepancy in measurements of the universe’s expansion speed.

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  2. Astronomy

    In 20th century, astronomers opened their minds to gazillions of galaxies

    Telescopes in the U.S. West opened astronomers’ eyes to a vast, expanding universe containing countless galaxies.

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  3. Astronomy

    Five gamma-ray blazars set new distance record

    Intensely bright galaxies are the farthest blazars ever detected in gamma rays.

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  4. Planetary Science

    Red Planet’s interior may not churn much

    The magma fueling a Martian volcanic system remained largely unchanged for billions of years, analysis of a newfound meteorite suggests.

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  5. Astronomy

    Spin may reveal black hole history

    High rate of spin could indicate that black holes formed from previous mergers of black holes.

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  6. Planetary Science

    Oxygen atoms from Earth bombard the moon

    Oxygen atoms originating from the upper atmosphere periodically bombard the moon’s surface, researchers propose.

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  7. Physics

    Possible sign of dark matter shows up again

    Excess of X-rays could indicate decaying sterile neutrinos.

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  8. Astronomy

    Conditions right for stars, planets near Milky Way’s supermassive black hole

    Four clouds of gas near the galactic center have roughly the right mass to be young stars, possibly with planets.

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  9. Animals

    Readers weigh in on mathematical animals and more

    Animal math, dinosaur digestion and more in reader feedback from our December 10, 2017, issue.

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  10. Life

    Asteroid barrage, ancient marine life boom not linked

    Impacts from asteroid debris probably didn’t trigger the boom in marine animal diversity around 471 million years ago during the Great Ordovician Biodiversification Event.

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  11. Planetary Science

    Weird wave found in Venus’ wind-whipped atmosphere

    A 10,000-kilometer-long gravity wave arched across the upper atmosphere of Venus. The feature may have been the largest of its kind in the solar system.

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  12. Climate

    Petrified tree rings tell ancient tale of sun’s behavior

    The 11-year cycle of solar activity may have been around for at least 290 million years, ancient tree rings suggest.

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