1. What does a star’s luminosity measure? 2. Why is the magnitude scale “backward” from what common sense dictates? 3. Does the star Betelgeuse, whose apparent magnitude is m = +0.5, look brighter or...

1. What does a star’s luminosity measure?

2. Why is the magnitude scale “backward” from what common sense dictates?

3. Does the star Betelgeuse, whose apparent magnitude is m = +0.5, look brighter or dimmer than the star Pollux, whose apparent magnitude is m = +1.1?