Stars are made of different materials depending on their size and temperature; larger, hotter stars are bluer while smaller, cooler stars appear more red. A star's brightness as seen from Earth depends on both its intrinsic luminosity and distance from Earth, with brighter stars visible from greater distances.

3. Color = Temperature

4. https://www.youtube.com/watch?v=HEheh1BH34Q

6. What stars are made of!

7. Depends on size AND temperature
Brightness from
Earth
Brightness from
Standard
Distance
(If all the stars were lined up
side by side)
(magnitude)