Answer:
Stars are made of gas, star color is related to temperature
Step-by-step explanation:
The options are as follows,
Stars are flat circles
Stars are made of gas
Star color is related to temperature
Star brightness depends on shape
Stars are big ball of gases mainly hydrogen and helium. Stars can be bigger than sun or smaller. They appear as flat circles but are spheres. The brightness of star depends on their size and distance but not on their shape. Color of star is related to temperature. A blue color star is hotter than a yellow star. A red star is a cool star.