1. Cosmology

    Dustup emerges over gravitational waves discovery

    While cosmologists wait for data from Planck satellite, some worry that BICEP2 data actually come from our galaxy.

  2. Cosmology

    The mysterious boundary

    A debate has arisen over whether an astronaut passing a black hole’s point of no return would get stretched to death or flash-fried. Resolving the controversy may lead to new insights about gravity and more.

  3. Cosmology

    Revamping the size of the universe

    Despite new telescopes and technology, no one knows whether the universe is infinitely large or even if what has been observed is the only universe that exists.

  4. Cosmology

    Universe re-created in computer simulation

    The Illustris Project traces the detailed evolution of the universe starting from 12 million years after the Big Bang.

  5. Cosmology

    See the sky in a different light

  6. Cosmology


    Readers weigh in on the Hubble constant, temperature extremes and heart screenings for student-athletes.

  7. Cosmology

    Galaxy’s gamma-ray glow may expose dark matter

    An excess of gamma rays at the center of the Milky Way could be a signature of dark matter.

  8. Astronomy

    Neutrinos from space rain down from all directions

    Using Earth as a filter, scientists detect thousands of neutrinos from beyond the solar system.

  9. Cosmology

    Speed of early universe’s expansion determined

    The rate known as the Hubble constant is measured with great precision for the universe of 11 billion years ago.

  10. playing cards

    Maybe time’s arrow needs ergodicity as well as entropy

    Explaining the arrow of time might require an equilibrium universe with hidden ergodic dynamics.

  11. Astronomy

    This winter warrior made the gravitational waves discovery possible

    Engineer Steffen Richter played an important role in the recent gravitational waves discovery, wintering at the Amundsen-Scott research station at the South Pole and making daily treks to keep the BICEP2 telescope running.

  12. Cosmology

    Cosmic question mark

    Two ways of measuring the universe’s expansion rate disagree by about 10 percent. One of the methods may be flawed. Or it could be that a hitherto unobserved phenomenon is at work.