Because their temperature seem to change too
Because their temperature is changing.
no way
White stars are usually the hottest, followed by blue stars and then red stars.
Because their temperature is changing.
Constellations
The earth is rotating around the sun. Therefore the position of other stars (although millions of light years away) are in different orientation to that of the earth.
This is a simple one to answer. The Earth rotates and as it rotates, the stars seem to move across the sky.
Stars have many colors. They are: red, blue, brown, white, yellow, etc.
Stars actually do rotate.
You can pick any group of stars that seem to form a certain shape. That would be an asterism.
one
When the sun or moon or stars are low in the sky (near the horizon), the light from them has to pass through much more air in the atmosphere than when they are high overhead. The extra passage through the atmosphere changes the color of the light reaching an observer.
Different colors of stars "usually" means different temperatures. I don't remember the temperature that each color corresponds with, but when stars are different colors it is usually due to their temperature.