A galactic fountain is _____.
a. a stream of gas and dust being pulled into a galaxy as it forms
b. a jet of high-speed superheated material thrown out of the accretion disk around a black hole
c. a partial spiral arm formed by the collision of molecular clouds
d. a bubble of hot, metal-rich gas ejected from the disk by a burst of supernova
e. a stream of gas made from a star that has been torn apart while falling into a supermassive black hole
Question 2
Einstein revolutionized modern physics by ____.
a. documenting the existence of gravity through experiments on objects in motion
b. proving that Galileo and Newton were fundamentally incorrect about gravity
c. explaining how specific gravity impacts the geometry of curved space-time
d. providing an explanation of gravity based on the geometry of curved space-time
e. defining the difference between violent motion and natural motion
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