02 February, 1998. Measurements of parallaxes made with the
Hipparcos satellite (see Chapter 13) suggest that the Galaxy may be younger than
previously thought. Hipparcos shows that some stars and nearby
open clusters are closer and therefore their stars not as bright.
Distances to globular clusters based on such stars therefore
alter our view of the luminosities and thus of the ages of the
globular cluster stars. One study suggests that globular clusters
might be as young as 12 billion years.