Virtually all the carbon-rich dust in the plane of the galaxy originated in
A) low-mass stars.
B) planetary nebulae.
C) high-mass stars.
D) brown dwarfs.
E) white dwarfs.
Question 2
Pulsars are thought to be ________.
A) unstable high-mass stars B) accreting black holes
C) rapidly rotating neutron stars D) accreting white dwarfs