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.
A method of measuring time based on time at the prime meridian/ ... Title, legend, grid system, direction, scale ... If you wanted to draw a map for the purpose of telling time, how many degrees ...
Answer:
each other I would assume is the last words to fill in the blank
Explanation:
Examples of statement include
The English putting Native Americans in reserves to reform them since they believe the Natives beliefs and religion was absurd.
African tribes wars lead to capturartion and enslavement of each other.
Answer:Continental crust is much thicker than oceanic crust (averages between 20 to 25 miles thick), but is actually slightly less dense than oceanic crust. The main type of rock on continents is called granite. So if these two types of crust were to collide into each other, what do you think would happen to the oceanic crust? As a whole, notice that the crust is lighter than the mantle
Explanation:
High levels of dissolved oxygen
