When considering the solar system on a galactic scale, what component is mentioned as perhaps the most significant mass holding galaxies together?

Answer

Dark matter

When examining how entire galaxies are held together, the principle of gravity remains, but the dominant mass is understood to include dark matter.

When considering the solar system on a galactic scale, what component is mentioned as perhaps the most significant mass holding galaxies together?

#Videos

The Solar System - What Holds It All Together? - YouTube

forcegravitystarsolar systemcelestial body