The H-R diagram for an open cluster gives special information because all stars in an open cluster are
A) the same age.
B) the same mass.
C) moving in the same direction.
D) the same spectral type.
Correct Answer:
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Q147: When plotted on an H-R diagram, the
Q148: The energy required to ionize the hydrogen
Q149: Evidence of massive amounts of hydrogen gas
Q150: The bright stars at the center of
Q151: The stars of a cluster are plotted
Q153: In an open cluster, the sizes of
Q154: In a group of stars with a
Q155: What radiation ionizes the hydrogen in an
Q156: Why are the stars in an open
Q157: Because all the stars in a cluster
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