News

  1. Physics

    Too speedy for gravity?

    A new analysis suggests that five different spacecraft gained more speed as they flew past Earth than can be accounted for by Einstein's theory of gravitation.

    By Ron Cowen
  2. Astronomy

    Supernova Outbreak: X rays signal earliest alert

    Thanks to a lucky break and an overactive galaxy, astronomers report the earliest detection yet of a normal supernova—the explosive death of a massive star.

    By Ron Cowen
  3. Earth

    Ocean ups and downs—the long view

    Sea level has dropped about 170 meters in the past 80 million years, thanks in part to the thinning of ocean crust and the formation of land-based ice sheets.

    By Sid Perkins
  4. Health & Medicine

    A Way Forward: Releasing the brakes on cancer vaccines

    A new way to overcome tumors' defenses against the immune system marks an important step toward effective cancer vaccines.