Which stars always have large positive absolute magnitude?
a. Stars of high luminosity.
b. Stars of low luminosity.
c. Nearby stars.
d. Distant stars.
e. Not enough information given.
B
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What is the primary factor in determining the classification for an elliptical galaxy?
a. size b. shape c. mass d. color
This image shows a colliding pair of galaxy clusters known together as the Bullet Cluster. The blue region represents a map of the cluster's dark matter. How was this blue map made?
A) The blue region was inferred from studies of how the cluster causes gravitational lensing of objects located behind it. B) The blue region represents X-ray emission from hot gas within the cluster. C) The blue region represents previously unknown radio emission from the dark matter. D) The blue region comes from the combined light of many young stars drawn together by the cluster's dark matter.
One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will
A) decrease. B) stay the same. C) increase. D) increase for half of the bubbles and decrease for the other half.
In general, fast reactions
a. are exothermic. b. are endothermic. c. have low activation energies. d. have high activation energies.