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:
The answer to this question is. The Huang He river often floods and when that happens, it can be disastrous. The floods damage homes, livestock, and has even caused fatalities. Dams have also never been able to fully contain the river.
**Brainliest would be appreciated**
Explanation:
Answer: fault plain
Explanation:
its called fault or fault plain i guess
Answer:
B) 12 hours of daylight.
Explanation:
B) 12 hours of daylight.
In near the equator we experience 12 hours of daylight as the equator is situated exactly the halfway in between the two poles. The North pole experiences long daylight in the months, when the North Pole is tilted towards the Sun and shorter daylight when the pole tilted away from the Sun. The reverse is true for the Southern Poles. But this wouldn't have any effects in daylight on the equator.
