What observational evidence do we have that quasars are the centers of very distant galaxies?
What will be an ideal response?
Telescopes in space and on Earth's surface have revealed that quasars are often surrounded by hazy features whose spectra resemble those of normal galaxies. Evidently, quasars are located in galaxies. In addition, radio telescopes have revealed that some quasars are ejecting jets and inflating radio lobes. The evidence is now overwhelming that quasars are the active cores of very distant galaxies.
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All stars spend approximately the same amount of time on the main sequence
Indicate whether the statement is true or false
In straight-line motion, if a moving object slows down, the direction of the acceleration is ______________ the direction of the velocity
Fill in the blank(s) with correct word
The internal resistances of an ideal voltmeter and an ideal ammeter are, respectively (ideal meaning the behavior of the system is not changed when using the meter):
a. zero and infinite. c. zero and zero. b. infinite and zero. d. infinite and infinite.
A stone is thrown straight up. When it reaches its highest point,
A) both its velocity and its acceleration are zero. B) its velocity is zero and its acceleration is not zero. C) its velocity is not zero and its acceleration is zero. D) neither its velocity nor its acceleration is zero. E) neither velocity nor acceleration can be determined without additional information.