Which of the following statements best supports the hypothesis that active galactic nuclei are powered by supermassive black holes?
A) Orbits of gas clouds within them indicate billions of solar masses of material in a small volume of space.
B) They are found in the centers of galaxies.
C) They have jets and accretion disks.
D) They emit radiation at all wavelengths, from the radio to the gamma rays.
A) Orbits of gas clouds within them indicate billions of solar masses of material in a small volume of space.
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If two straight lines start out parallel but eventually cross, then they must be in a
A) flat geometry. B) saddle-shaped geometry. C) spherical geometry. D) spacetime geometry.
In neon, the 20.80-eV level can undergo lasing action to the 17.43-eV level. What is the energy of the resulting photons?
a. 20.80 eV b. 17.43 eV c. 38.23 eV d. 3.370 eV e. 1.685 eV
Website administrators relay on ______, which is data such as the number of users who commented on, shared, viewed, or liked webpage content.
A. analytics B. benchmarking C. cookies D. hits
Excess atmospheric _______________ indicates that Venus once had substantial amounts of water on its surface
Fill in the blank(s) with correct word