Dark matter had no effect on the distribution of matter in the early universe
Indicate whether the statement is true or false
FALSE
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Which of the following happens when a star runs out of hydrogen at its center?
A) The core of the star expands. B) The outer layers of the star heat up. C) The star moves toward the lower left in the Hertzsprung-Russell diagram. D) The stellar core becomes almost pure helium
A _______ is used to produce and analyze a spectrum
a. photo b. spectrograph c. photometer d. charge-coupled device
The amount of 
Ar is one-ninth the amount of 
K. If the half-life of the latter is T, what is the rock’s age?
A. T B. T/9 C. 9T D. ln(9T) E. T/ln 9 F. Some other result (specify)
Sound traveling in air at 23.°C enters a cold front where the air temperature is 2.°C. If the sound frequency is 1500. Hz, determine the speed in the warmer air and in the colder air
What will be an ideal response?