What is the local group?

Question

BlackTom AI · Accepted Answer

To analyze the question, we consider what the term 'local group' refers to in astronomy. 
Option 1: 'A group of galaxies including the Milky Way galaxy.' This is the correct understanding of the Local Group, which is a gravitationally bound collection of nearby galaxies that includes the Milky Way, Andromeda (M31), the Large and Small Magellanic Clouds, and several dozen dwarf galaxies. The Local Group is characterized by its members and their mutual gravitation. 
Option 2: 'A group of galaxy clusters.' This describes a larger-scale structure known as a supercluster or cluster complex, not the Local Group, which is on a much smaller, galaxy-scale level.
Option 3: 'A group of superclusters.' Superclusters are enormous assemblies of galaxy clusters spanning hundreds of millions of light-years, far larger than the Local Group. Thus this option misidentifies the scale and composition.
Option 4: 'A local stars in the spiral arm of the Milky Way Galaxy.' This option confuses stellar collection within a spiral arm with a grouping of entire galaxies. The Local Group is about galaxies as units, not individual stars locally within our galaxy. 
Overall, only the first option correctly describes the Local Group as a group of galaxies that includes the Milky Way.

COS SPR 25 class 2 Jan 14 Introduction and Ch1: A Modern View of the Universe

What is the local group?

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