When supermassive black holes have access to "fuel" what are they?
A) Planetary nebulae.
B) Gamma-ray bursts (GRBs).
C) They get pulled apart by tidal forces.
D) Type III Supernovae.
E) Quasars and active galactic nuclei (AGNs).
Ans: E) Quasars and active galactic nuclei (AGNs).
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Waves on a lake pass under a floating bird causing the bird to bob up and down with a period of 2.5 seconds. If the distance from wave trough to wave trough is 3.0 meters, what is the speed of the wave?
A) 0.21 m/s B) 1.2 m/s C) 1.9 m/s D) 2.1 m/s E) 1.5 m/s
What is the Sun mainly made of?
A) hydrogen and oxygen B) hydrogen and helium C) carbon and nitrogen D) oxygen and carbon E) nearly equal portions of all the elements
For most of history, the lack of observable stellar parallax was interpreted to mean that ________
A) stars must all lie at the same distance from Earth, on the celestial sphere B) Galileo's theories of the universe were essentially correct C) stars were too far away for parallax to be measured with available technology D) Earth is stationary at the center of the universe
Alone of all the Galilean moons, Callisto shows no sign of plate tectonics
Indicate whether the statement is true or false