Why galaxies have spiral shape? (1 Viewer)

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

how can this be explained?


Gold Member
Space Tiger answered this very nicely when someone asked about the solar system being on a 'plane'. As matter with angular momentum comes together, a disk shape is the most natural organization. The spiral aspect is probably (as my guess) the result of matter arriving at irregular intervals and attaching itself to the nearest gravity source. As more stuff accumulates, the gravitational attraction in that area increases and attracts more matter, and thus it escalates.

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving