What are the most common elements in the atmospheres of Jupiter and Saturn?
a. water
b. hydrogen and helium
c. oxygen and nitrogen
d. oxygen and carbon
e. none of the above
Answer: b. hydrogen and helium
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Nebula is just another name for the interstellar medium (ISM)
a. True b. False Indicate whether the statement is true or false
When air rapidly expands, its temperature will
1) decrease, 2) increase, 3) stay the same, whereas when air is rapidly compressed, its temperature will 4) decrease. 5) increase. 6) stay the same.
X-rays of wavelength 0.080 nm are used in a Bragg scattering experiment with a crystal. If the first order maximum is found at a grazing angle of 
what is the plane spacing in the crystal?
A. 0.31 nm B. 0.71 nm C. 1.4 nm D. 0.38 nm E. 0.77 nm
What produces the blueish haze in the middle of the Crab Nebula?
A.) It is primarily from emission lines of oxygen. B.) It is produced by smashing streams of gas. C.) It is produced by accelerated electrons. D.) It is a condensing Hydrogen cloud. E.) We don't know.