Redshift measurements of the visible afterglow of a gamma-ray burst show that these objects are:
A) in the solar neighborhood.
B) in the Milky Way Galaxy.
C) in the Local Group.
D) billions of light-years away.
E) at the most extreme observable distances.
D
You might also like to view...
How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't; Earth's orbital distance plays no significant role in the seasons. B) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere. C) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres. D) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same.
If the Sun suddenly stopped emitting neutrinos, what might we infer (after checking that our neutrino detectors were still operational)?
A) Fusion reactions in the Sun have ceased within the past few minutes. B) Fusion reactions in the Sun ceased a few hundred thousand years ago. C) Fission reactions in the Sun have ceased. D) The Sun has exhausted its supply of neutrinos.
What does the CNO cycle and the hydrogen proton-proton cycle have in common? Choose the best answer to the question
A) They both trigger at the same temperature. B) They both are ways to fuse hydrogen nuclei to make helium. C) They are both cycles in star lives. D) They are both nuclear reactions; the CNO cycle makes carbon, nitrogen, and oxygen, and the proton cycle makes helium.
Sunlight can break apart water (and other) molecules in a process called ________.
A. differentiation B. erosion C. sublimation D. photodissociation