Ask an Astronomer: Why Do We See Spiral Arms in Some Galaxies?

An illustration depicts the spiral structure of a galaxy. Caption: Many galaxies have a spiral structure,

In this episode, scientist Steve Lord explains the relationship between gravity and the shape of galaxies. Gravitational forces from the galaxy's core causes all the stars to rotate. This rotation causes spiral waves. Part of the "Ask an Astronomer" series.

(Source: DCMP)

Metadata

Keywords:
astronomy

Files 1

  • Ask an Astronomer: Why Do We See Spiral Arms in Some Galaxies?

    Type:
    Video
    Format:
    Streaming
    Accommodations:
    English Audio Descriptions - Visual, English Captions - Auditory
    Languages:
    English
    License:
    DCMP Membership
    Author:
    NASA Jet Propulsion Lab
    Length:
    1 minute