________ are remnants of low-mass stars.
A. White dwarfs
B. Pulsars
C. Black holes
D. Neutron stars
Answer: A
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Which of the following is NOT an argument for Cygnus X-1's being a true black hole?
A) Spectroscopic data suggests hot gas is flowing from the companion B star onto Cygnus X-1. B) The mass of the visible B star is even greater than Cygnus X-1, at around 25 solar masses. C) Cygnus X-1's mass is estimated to be about 10 solar masses. D) X-rays from Cygnus X-1 vary on time scales as short as a millisecond. E) X-ray observations around the object support a temperature of several million K.
The Eocene is a(n)
a. epoch. b. era. c. eon. d. period.
A current can be made to flow in a wire if
a. it is connected to a battery c. a magnet is put into motion near it b. it is put into motion near a magnet d. all of the above
Which of the following is thought to have to do with producing a 1 minute long gamma-ray burst?
A. a supernova B. dark matter C. a planetary nebula D. a quasar E. dark energy