Into how many constellations is the celestial sphere divided?
A) 12
B) 44
C) 57
D) 88
E) 110
D
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In stellar astronomy, _____ states that the weight on each layer of a star is balanced by the pressure in that layer
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
Our Solar System formed 14 billion years ago with the Big Bang
a. True b. False Indicate whether the statement is true or false
What are all the black spots on this object?
A) volcanoes on Jupiter's moon Io B) methane lakes on Saturn's moon Titan C) impact craters on Uranus's moon Miranda D) wind streaks on Neptune's moon Triton E) giant cliffs on the planet Mercury
What evidence do we have that Earth's magnetic field reverses its polarity every 250,000 years?
A. Earth's magnetic field strength and direction change constantly. B. The direction of the magnetic field is "frozen" into new crust as it cools. C. historical documents from ancient Egypt and other civilizations D. Core samples from Antarctica show a regular change in polarity. E. All of these choices are correct.