Answer:
red giant stars/ red hyper giants 
Explanation:
take stephenson 2-18 for example the star is only 3200k where the sun is around 5000k.
 
        
             
        
        
        
Answer:
1- Light , 2-Heat , ( and Nuclear energy)
Explanation:
 
        
             
        
        
        
Answer: 1141km
Explanation:
Given the following :
Distance due west = 915m
Distance due North = 681m
The magnitude of the Displacement =?
The information above produces a right angle triangle and the magnitude of the displacement can be calculated using Pythagoras rule :
The Magnitude of the woman's Displacement represents the hypotenuse of the triangle:
From Pythagoras :
Hypotenus = √(opposite)^2 + (adjacent)^2
Hypotenus = √(915)^2 + (681)^2
Hypotenuse = √1300986
Hypotenuse= 1140.6077
The magnitude of woman's displacement =  1140.6077 = 1141(to the nearest kilometer).