The Universe - Season 4 - Eps 7: The Search for Cosmic Clusters
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.
About The Universe

Title: The Universe
First Air Date: 2007-05-29
Last Air Date: 2015-05-23
Status: Ended
Rating: 7.9/10 (from 170 votes)
Language: EN
Seasons: 10
Total Episodes: 88
Network: History H2
Genres: Documentary
Production Companies: Flight 33 Productions
Synopsis
From the planets to the stars and out to the edge of the unknown, history and science collide in a wondrous yet deadly adventure through space and time.
Cast

David Ackroyd

Erik Thompson