Red giants are very bright because they are very hot.___Most known stellar masse

Question

Red giants are very bright because they are very hot.___Most known stellar masses have been determined from observations of binary-star systems.___On the main-sequence, O-type stars are more massive than M-type stars.___It is impossible to have a 1 billion year old O or B type main-sequence star.___Luminosity class V stars are larger than class la stars.___Probably the majority of all stars are single star like our own.___The mass of the newly formed star will determine its position on the main sequence.___White dwarfs lie on the lower left portion of the H-R diagram.___The main-sequence runs from the top right to lower left on the H-R diagram.___A G2V star would be the same temperature as a G2Ib star, but much smaller and less luminous.___Dark dust clouds may be optically invisible, but still give off much radio energy.___Bright red is the predominant color of emission nebulae, from ionized hydrogen.___O and B type stars are usually found associated with emission nebulae.___Interstellar matter is quite evenly distributed throughout the Milky Way Galaxy.___

Explanation / Answer

1) false

2) true

3) true

4) true

5) false

6) true

7) true

8) true

9) false

10) false

11) true

12) true

13) false

14) true

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