Match each of the following terms to its proper description. 1: Main sequence 2: Wien's Law 3: Stefan's Law 4: Parallax 5: Turn-off point 6: HR Diagram 7: Luminosity匹配题

A

The relationship between a star's peak wavelength and its temperature.

B

The region within which stars spend most of their normal hydrogen-burning lives

C

A plot of a star's luminosity versus its temperature.

D

The spot on an HR Diagram when the stars begin to move off the main sequence. It can be used to determine the age of a cluster.

E

The total energy radiated per second from the entire surface of a star.

F

The apparent movement of an object due to the change in the position of the observer.

G

Predicts the total amount of energy any hot object should emit as radiation per second per unit area.

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Stars of spectral type [Fill in the blank] leave the main sequence first, while stars of spectral type [Fill in the blank] leave the main sequence last. Give both spectral types as capital letters.

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判断题：寒冷的红色恒星最先离开主序星。

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