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.
Answer:
O Today scientists are devising ways to use advancements in positive ways for the environment.
Explanation:
The emphasis on agricultural technology today compares to recent past in such a way that today, scientists are devising ways to use advancements in positive ways for the environment.
- Today, there is a strong emphasis on the environment when discussing issues of agricultural technology.
- Not only is the aim to improve output and productivity, priority is also given to the environment.
I think its A. small contained climates that differ from areas surrounding them
hope this helps XD
