Answer to Question 1

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Star Luminosity (Sun = 1) Surface Temp (K) Group
Sun 1.0 5800 Main sequence
Betelgeuse 20 000 3000 Red Supergiant
Aldebaran 200 4700 Giant
Regulus 200 14000 Main Sequence
Rigel 20000 13000 Main Sequence
Sirius B 0.002 20000 White Dwarf