What does this imply Active galactic nuclei exist tend to become less active as

What does this imply active galactic nuclei exist

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galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply? Active galactic nuclei exist tend to become less active as they age. Why are telescopes sometimes called "time machines"? Because observations of distant objects reveal them as they were in the past. How does the interstellar medium obscure our view of most of the galaxy? It absorbs visible, ultraviolet, and some infrared light. How do we learn about what is going on in the center of our own galaxy (the Milky Way)? We cannot see the galactic center with visible or ultraviolet light, but radio and X-rays from the center can be detected. Why do we believe that starburst galaxies represent a temporary stage in galaxy evolution? Such galaxies produce so much light that they would have consumed all their gas long ago if they had always been forming stars at this high rate. What two quantities did Edwin Hubble plot against each other to discover the expansion of the Universe? velocity and distance. Based on the results from Planck, the overall composition of the universe is? 4% ordinary (baryonic) matter, 23% nonbaryonic dark matter, 73% dark energy. Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies? Dark matter is the dominant form of mass in both clusters and in individual galaxies. Which of the following is not one of the three main strategies used to measure the mass of a galaxy cluster?
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  • Fall '12
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  • following statements, Edwin Hubble

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