Stars

How do astronomers zero in on the spectrum of a single star?
What is the difference between "twin suns" and "binary suns"?
Do single stars tend to rotate in the same direction as the Sun and/or the Galaxy?
Is Betelgeuse shrinking?
How much of the Sun has been used up?
How long does it take for stars to explode?
How old are small stars?
Is the Sun yellow or white?
Would the constellations we see from Earth look any different from other planets in our solar system?