Which of the following indicates dark matter in a galaxy?The recommended time to answer this question is 2.5 minutes.Soru 25YanıtMost stars orbiting the galactic center have similar velocities.The galaxy is brighter than expected.The presence of a bar-like structure in the bulge of the galaxy.The diameter of the disk of the galaxy increases over time.The stars in certain regions of the galaxy appear fainter than they should be.
Question
Which of the following indicates dark matter in a galaxy?The recommended time to answer this question is 2.5 minutes.Soru 25YanıtMost stars orbiting the galactic center have similar velocities.The galaxy is brighter than expected.The presence of a bar-like structure in the bulge of the galaxy.The diameter of the disk of the galaxy increases over time.The stars in certain regions of the galaxy appear fainter than they should be.
Solution
The presence of dark matter in a galaxy is indicated by the first option: "Most stars orbiting the galactic center have similar velocities." This is because the velocity of stars in a galaxy, especially those in the outer regions, is determined by the total mass of the galaxy. If most stars have similar velocities, it suggests that there is more mass present than what we can observe (i.e., the visible stars and gas). This unseen mass is what we refer to as dark matter.
Similar Questions
The mass of Dark Matter in the Milky Way Galaxy is roughly;The recommended time to answer this question is 2.5 minutes.Soru 22Yanıtten times the total mass of the Stars.hundred times the total mass of the Stars.one tenth of the total mass of the Stars.one percent of the total mass of the Stars.one thousandth of the total mass of the Stars.
The locations of exotic and ordinary dark matter seem even more counterintuitive than turning yourheadlights down instead of up when you drive into a fogbank. Because of gravity, matter attracts matter.Therefore, matter tends to concentrate toward the center of any aggregate of mass. So we would expectmatter to be most abundant at the core of a galaxy or galaxy cluster, not in the outer extremities. Yet in thecase of both exotic dark matter and ordinary dark matter, astronomers observe the opposite.
It is known that galaxies A and B are very similar to each other. Galaxy B appears 25 times fainter than galaxy A. Assuming that there are no other fading effects in the universe;The recommended time to answer this question is 5 minutes.Soru 12Yanıtgalaxy B is 3 times further away from galaxy A.galaxy B is 4 times further away from galaxy A.galaxy B is 5 times further away from galaxy A.galaxy B is 6 times further away from galaxy A.galaxy B is 7 times further away from galaxy A.
Which of the following are NOT possible candidates for dark matter?Group of answer choicesBlack holesBrown DwarfsMACHO'sRed Giant Stars
State the relationship between the brightness of a galaxy and its luminosity.
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