Tag: sunspots

  • Nation & World

    Stars’ age: A well-kept secret

    Harvard researchers have found that stars slow down as they age, and their ages are well-kept secrets. But astronomers are taking advantage of the first fact to tackle the second and tease out stellar ages.

    4 minutes
  • Nation & World

    Galileo’s reach

    Some four centuries after Galileo observed spots on the surface of the sun, historians, musicians and actors came together at Harvard on Oct. 4 for an all-day conference to celebrate his discovery.

    3 minutes