for 14 i observed the galaxy end aroung 5 kpc.I need help with 18 Below is the measured rotation curve for the stars in NGC 3198.14) Draw and label a vertical line at the radius where you observed the galaxy to end.NGC 3198400350300250200150100501015202530Radius (kpc)RotationalSpeed (km/s) Many spiral galaxies, including the Milky Way, have rotation curves similar to that ofNGC 3198. The enclosed mass (MR) continues to increase beyond the radius at which thelight of the galaxy stops. (In fact, the enclosed mass curve increases proportional to distance:MR x R.)18) Based on your analysis of the image and rotation curve of NGC 3198, why is the flatnessof the rotation curve beyond the visible edge of the galaxy evidence for dark matter?

Required : Why is the flatness of the rotation curve beyond the visible galaxy evidence for dark matter. The speed of the stars beyond the visible galaxy has been calculated to be very high and still the stars are not falling apart, this suggests that there is some invisible matter that is holding the stars outside the visible galaxy due to gravitational attraction. Hence the flatness of the rotation curve beyond the visible galaxy is an evidence of dark matter.

Answered: Based on your analysis of the image and…

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Advanced Physics

Based on your analysis of the image and rotation curve of NGC 3198, why is the flatness of the rotation curve beyond the visible edge of the galaxy evidence for dark matter?