What processes are involved in the sunspot cycle?
A) gravitational contraction of the Sun
B) wave motions in the solar interior
C) variations of the solar thermostat
D) the winding of magnetic field lines due to differential rotation
E) the interaction of the Earth's magnetic field with that of the Sun
D
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The ___________ hypothesis of the formation of the solar system uses sudden events that drastically alter the form of the early solar system
Fill in the blank(s) with correct word
The full moon by definition occurs
a. for only a day. b. for 7-3/8 days. c. only for an instant. d. only once every month.
If a body were in orbit very near the surface of the earth, its centripetal acceleration would be equal to g
Indicate whether the statement is true or false
What was the significance of the end of the era of nucleosynthesis, when the universe was about 5 minutes old?
A) The basic chemical composition of the universe had been determined. B) The proportions of dark matter and luminous matter had been determined. C) It marks the time at which the first stars formed. D) It marks the time at which the expansion of the universe had settled down to its current rate.