NA review - Galaxies & Constellations

Galaxies, stars, solar systems, and planets all form due to ___ force

Every proton, neutron, electron, atom, molecule, particle is attracted to every other proton, neutron, electron, atom, molecule, particle in the universe by a ___ force

There ___ theory (theories) as to how galaxies formed

• is only one

• is a small number of competing

Our galaxy is called

Our galaxy is called the Milky Way because

At the center of most galaxies is a

How do we know there is a supermassive black hole at the center of most galaxies?

What is the name of our supermassive black hole at the center of Milky Way?

Why don't we think we'll ever get a good image of Sagittarius A?

It would take light ___ years to travel a distance equal to the radius of our galaxy so it is ___ light years across.