Suppose you repeated the famous COBE and Planck observations of the cosmic microwave background, with a slight different observational setup, to check their results. Which of the following observations would be surprising and contradict earlier findings?
A) You find that cosmic microwave background has a temperature of 2.73 K.
B) You find that cosmic microwave background has an almost perfect thermal spectrum.
C) You find that cosmic microwave background contains redshifted emission lines of hydrogen and helium.
D) You find that cosmic microwave background looks essentially the same in all directions.
E) You find that cosmic microwave background has tiny temperature fluctuations at the level of about 1 part in 100,000.
C) You find that cosmic microwave background contains redshifted emission lines of hydrogen and helium.
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In stellar astronomy, _____ states that the weight of each layer of a star must be supported by the layer below
A) the law of conservation of mass B) the law of conservation of energy C) the law of hydrostatic equilibrium D) the law of energy transport
Deuterium and lithium-7 are part of the 4.5% normal matter
a. True b. False Indicate whether the statement is true or false
Why is January a cold month in the northern United States?
A) Earth is near its farthest point from the sun. B) There's more snow in January. C) The northern hemisphere is farther from the sun than the southern hemisphere. D) The northern hemisphere is tilted away from the sun.
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.