Ken Croswell

Ken Croswell has a Ph.D. in astronomy from Harvard University and is the author of eight books, including The Alchemy of the Heavens: Searching for Meaning in the Milky Way and The Lives of Stars.

All Stories by Ken Croswell

  1. M83 galaxy

    Runaway stars may create the mysterious ultraviolet glow around some galaxies

    Hot blue stars kicked out of their birthplace can travel thousands of light-years to their galaxies’ hinterlands, new computer simulations show.

  2. Leo I galaxy

    The Milky Way makes little galaxies bloom, then snuffs them out

    When dwarf galaxies cross the Milky Way’s frontier, our galaxy compresses their gas, sparking star birth, but then robs them of their star-making gas.

  3. Milky Way star cluster

    The Milky Way’s most massive star cluster may have eaten a smaller cluster

    Observations of newfound stars suggest how the gathering of stars at the galaxy’s core grew so big.

  4. Hyades star cluster

    The star cluster closest to Earth is in its death throes

    Gaia spacecraft observations of stars’ motion within and fleeing the cluster suggest the 680-million-year-old Hyades has only 30 million years left.

  5. Leo P galaxy

    How tiny ‘dead’ galaxies get their groove back and make stars again

    Computer simulations explain how puny galaxies can sustain star formation: Gas falls into them and billions of years later begins to create new stars.

  6. Astronomy

    High-speed gas collisions prevent star birth in galaxies’ bars

    The spiral galaxy NGC 1300 makes few if any stars in its bright bar. Simulations suggest gas clouds colliding at high speed stunt star formation.

  7. Milky Way

    Astronomers have found the edge of the Milky Way at last

    Computer simulations and observations of nearby galaxies let astrophysicists put a firm number on the Milky Way's size.

  8. Quasar Markarian 231

    Molecular oxygen has been spotted beyond the Milky Way for the first time

    Astronomers have detected molecular oxygen in another galaxy for the first time. The discovery is only the third sighting beyond our solar system.