What Are Globular Clusters? скачать в хорошем качестве

What Are Globular Clusters?

Join this channel to get access to perks:    / @astrophil2000   Support this channel on Patreon:   / astrophil   Welcome, my name is Phil, and in this video I explain what globular clusters are. Globular clusters are densely packed clusters of stars that typically orbit outside the main disk of spiral galaxies. They are old and have no gas in them. Typically thought of as dwarf galaxies that formed early in the history of the universe they are home to some of the oldest stars. These are population II stars which have very low metallicity (heavy elements other than hydrogen and helium). However, they also contain young blue stars which should not be there if the clusters formed their stars together along time ago. Instead of forming from gas clouds, like most stars, these young blue stars form from the merger of two smaller older red stars. This is possible as stars in globular clusters are very close to each other, with many in close binary system which eventually spiral inwards and collide. Another consequence of the densely packed stars is that no planets have been found. Any planets that do form are quickly ejected as rogue planets.