Answer: is constant
Explanation:
In order to analyze the velocity of the stars within a galaxy, the <u>galaxy rotation curves</u> (developed by the American astronomer Vera Rubin) are used. These graphs are elaborated as a scatter diagram in which the orbital velocity of the stars present in a galaxy is represented on the Y axis and the distance of these stars to the center of the galaxy on the X axis.
Thanks to this diagram, it has been possible to observe a characteristic behavior in the rotation speed of the stars (and gas) present in the galaxies, which differs from the rules of the orbital movement of the planetary systems postulated by Newton and Kepler.
This means that in these galaxy rotation curves it has been observed that the rotation speed of stars and gas is "constant", regardless of the distance to the center of the galaxy. This discrepancy and these results were then used to demonstrate the existence of dark matter in the universe.
Well a cinder cone volcano doesn't have a top. It was a funnel like shape most likely caused by the volcano violently erupts.
Composite volcanoes do have a point that is made up of past eruptions
Answer:
all of the above
Explanation:
Jobs people choose, what they do in their free time, how they travel, are all the consequences of the Earth's physical activities.
Vegetation, climate, land formation influence peoples' lives as people need to adapt to all the features of Earth and control and constrain the choices people make.
There is the indian ocean or the arabian sea is west of India or the the bay if bengal is west
Answer:
10,15,20,25
Explanation:
union mean the combination of all
