The more massive star in a binary system is always farthest from the center of mass
a. True
b. False
Indicate whether the statement is true or false
False
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For finding the distance to M31, Hubble relied upon:
A) RR Lyrae stars in its globular clusters. B) type I supernova in its core. C) type II supernova in its spiral arms. D) Cepheid variables in its spiral arms. E) planetary nebulae near its core.
The remnant left behind by a white-dwarf supernova is a neutron star
Indicate whether the statement is true or false
Which of the following cannot be true of the very first stars formed in the universe?
A) Some may have formed in large clusters. B) Some may have all exploded as supernovae by now. C) Some may have formed singly, in isolation from one another. D) Some may still exist in the Milky Way today. E) Some may have had rocky planets around them.
In solid-solution strengthened metals, substitutional and interstitial solid-solution atoms interact with _________dislocations in the metal.
Fill in the blank(s) with the appropriate word(s).