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  • illustration of sun, Earth and moon
  • illustration of ancient earth
  • air bubbles in a rock
Your search has returned 14 articles:
  • News in Brief

    Oxygen atoms from Earth bombard the moon

    Life on Earth may have made its mark on the moon billions of years before Neil Armstrong’s famous first step.

    Observations by Japan’s moon-orbiting Kaguya spacecraft suggest that oxygen atoms from Earth’s upper atmosphere bombard the moon’s surface for a few days each month. This oxygen onslaught began in earnest around 2.4 billion years ago when photosynthetic microbes first flourished...

    01/30/2017 - 11:00 Planetary Science
  • News in Brief

    Methane didn’t warm ancient Earth, new simulations suggest

    Methane wasn’t the cozy blanket that kept Earth warm hundreds of millions of years ago when the sun was dim, new research suggests.

    By simulating the ancient environment, researchers found that abundant sulfate and scant oxygen created conditions that kept down levels of methane — a potent greenhouse gas — around 1.8 billion to 800 million years ago (SN: 11/14/15, p. 18). So something...

    09/26/2016 - 15:00 Climate, Earth, Oceans
  • News

    Ancient air bubbles could revise history of Earth’s oxygen

    Whiffs of ancient air trapped in rock salt for hundreds of millions of years are shaking up the history of oxygen and life on Earth.

    By carefully crushing rock salt, researchers have measured the chemical makeup of air pockets embedded inside the rock. This new technique reveals that oxygen made up 10.9 percent of Earth’s atmosphere around 815 million years ago. Scientists have thought...

    07/25/2016 - 07:00 Earth, Chemistry, Evolution
  • Feature

    Science News of the Year 2005

    Science News of Yesteryear

    Anthropology & Archaeology

    Astronomy

    Behavior

    Biomedicine

    Botany & Zoology

    Cell & Molecular...

    12/20/2005 - 03:53 Humans & Society
  • Feature

    Science News Books

    11/18/1995 - 00:00
  • Feature

    Science News Books

    11/23/1991 - 00:00
  • Feature

    Amber Yields Samples of Ancient Air

    11/07/1987 - 00:00
  • Feature

    Science News of the Year

    12/21/1974 - 00:00
  • Feature

    1964 Science Review

    12/19/1964 - 00:00
  • Feature

    1963 Science Review

    12/21/1963 - 00:00