How do astronomers create three-dimensional maps of the universe?
A) through the comparison of computer models of galaxy formation with observations
B) by using a galaxy's position on the sky and its redshift to determine its distance along the line of sight
C) by carefully measuring the parallax of each galaxy
D) by interpreting the peculiar velocities of each galaxy
E) by using a galaxy's position on the sky and its brightness as a measure of distance along the line of sight
B
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Wien's law can only tell us about the surface temperature of a star, not the temperatures of the star's interior.
Answer the following statement true (T) or false (F)
You are moving at a speed 2/3 c toward Randy when shines a light toward you. At what speed do you see the light approaching you?
A) 2/3 c B) 4/3 c C) c D) 1/3 c
When the electrons in an atom are in their lowest possible energy levels, the atom is said to be in its ____________________ state
Fill in the blank(s) with correct word
The ________-year solar cycle is characterized by a variation in the number of sunspots through a reversal of the magnetic polarity of the Sun as a whole
A) 2 B) 10 C) 11 D) 22 E) 44