Link to The universe (S4): 7- The search for cosmic clusters documentary
Documentary Description
They are the one-stop-shopping places for learning
all about the nature and variety of stars in the Universe. They're
unique, because in clusters, all the stars were born at about the same
time, from the same material and all are at the same approximate
distance from Earth. This means we can be sure that any differences
among them are due to their true natures and not distorted by different
distances from Earth and other factors. In this episode, two kinds of
star clusters in the galaxy are explored. "Open Clusters" are young,
live in the spiral arms of the galaxy and give us insight into the
birth and formation of stars. "Globular Clusters" are old, live in the
outskirts of the galaxy and could be nearly as old as the Universe
itself. In addition, explore Galaxy clusters to reveal the large-scale
structure of the Universe, which is expanding so fast that eventually
all other galaxies, except for our own, will literally disappear from
our sight.
