Galaxies and gravity - Khan Academy

What holds galaxies together? 

• a tight asteroid belt

• gravity

What are the 2 factors that have an effect upon the strength of gravity? 

• distance and time

• time and speed

• distance and mass

• mass and speed

What is causing the Milky Way Galaxy and the Andromeda Galaxy to be pulling together? 

• the force of gravity

• Star production is increasing

• the galaxies are getting cold

When it comes to what keeps the universe, galaxies, and solar systems working and organized in the way it it, ___________ is the most important force.

• electromagnetism

• friction

• gravity