Which of the following is not used as a distance indicator for galaxies?
a. Large globular clusters
b. Herbig-Haro objects
c. H II regions
d. Cepheid variable stars
e. Supernovae
B
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The__________is the fate of the Universe if dark energy increases with time and galaxies, stars, and even atoms are eventually pulled apart by the accelerating expansion of the Universe
A) big bang B) big dipper C) big collision D) big rip
The gas motions within granules on the solar surface are
a. upward in the centers of some cells and downward in others; the gas cools as it passes between individual granules. b. actually motionless. The dark regions are absorption features from gases in the photosphere. c. upward in the bright cell centers and downward around the darker edges. d. downward in the bright cell centers and upward around the darker edges.
What is surprising about Earth's Moon?
A) It is surprisingly large in comparison to the size of its planet. B) It orbits surprisingly far away from Earth. C) It has a surprisingly large number of craters. D) The fact that it lacks a significant atmosphere.
Fusion of hydrogen nuclei is the origin of solar energy
Indicate whether the statement is true or false