Question

what is luminosity? (vertical axis of h - r diagram)
what are the two factors that determine a stars luminosity?
1.
2.
what is a galaxy?
what type of galaxy is the milky way?
where in the milky way is our solar system located?
how does our galaxy move?
1.
2.

Explanation:

Luminosity is the total amount of energy a star radiates per second. The two factors determining a star's luminosity are its surface - temperature and its size. A galaxy is a massive, gravitationally - bound system that consists of stars, stellar remnants, an interstellar medium of gas and dust, and dark matter. The Milky Way is a barred spiral galaxy. Our solar system is located in one of the spiral arms, about two - thirds of the way from the center of the Milky Way to its outer edge. Galaxies move through space due to the expansion of the universe and gravitational interactions with other galaxies.

Answer:

What is luminosity? (vertical axis of H - R diagram): The total amount of energy a star radiates per second.
What are the two factors that determine a star's luminosity?

1. Surface temperature
2. Size

What is a galaxy? A massive, gravitationally - bound system of stars, stellar remnants, gas, dust, and dark matter.
What type of galaxy is the Milky Way? Barred spiral galaxy.
Where in the Milky Way is our solar system located? In one of the spiral arms, about two - thirds of the way from the center to the outer edge.
How does our galaxy move? Due to the expansion of the universe and gravitational interactions with other galaxies.