Uncategorized

  1. Astronomy

    Deep Impact

    Data from the Deep Impact mission reveal that the bullet that slammed into Comet Tempel 1 on July 4 excavated material that likely hadn't seen the light of day since the birth of the solar system 4.5 billion years ago.

    By Ron Cowen
  2. Math

    Fermat’s Natural Spirals

    Using points to trace out spirals produces intriguing secondary patterns.

    By Ivars Peterson
  3. Earth

    Changing Earth

    Developed by the Smithsonian Institution’s National Museum of Natural History, this Web site focuses on Earth’s history. Visitors learn basic concepts of geological processes and evolution as well as gain a deeper understanding of how and why Earth changes and the impact of these changes on living organisms throughout its history.