Why do the oldest stars we observe contain almost nothing but hydrogen and helium?
What will be an ideal response?
This first generation of stars must be made of the elements produced in primordial nucleosynthesis, which had time only to turn 25% of the hydrogen into helium.
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If telescope A is 160 cm in diameter, and telescope B is 32 cm in diameter, how much more light does telescope A gather than telescope B?
a. 5 times b. 10 times c. 20 times d. 25 times e. 100 times
The magnitude of the charge on an electron is approximately:
A) 1023 C B) 10-23 C C) 1019 C D) 10-19 C E) 109 C
If the merger theory is correct, the brightest active galactic nuclei should:
A) be in the smallest elliptical galaxies. B) contain the youngest stars. C) contain the least mass. D) contain supermassive black holes. E) form small irregular galaxies.
For the multiplication of 4.4 m times 1.5 m, the result should be reported with how many significant figures?
a. Two b. One c. Three d. Four e. Seven