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:
All of the above are correct.
Explanation:
The Mughal Empire was an empire that existed in India for several centuries. It emerged as a military power in Central Asia, but it set its eyes on India and after successive military campaigns big portion of India was conquered. The Mughals were of mixed Turkic and Mongol ancestry when they came to India, and they were also Muslim, while over time there was also gradual Persian influence.
This resulted in bringing in new cultural characteristics which resulted in some changes in India. A new type of art was introduced, the style of architecture changed, and there was a big religious influence. The legacy can be seen even nowadays, as the artistic elements that the Mughals brought in are still present, the architecture as well, with a lot of historical monuments being made by them, and a large portion of the population in the Indian subcontinent is Muslim.
The explanation for the differences in wavelength observed from earth and a distant star with a shift towards the red end of the spectrum is the Redshift- Doppler effect.
<h3>What is the Doppler effect?</h3>
The Doppler effect is the difference that occur between the frequency of a wave in relation to observer from the wave source.
The wavelength changes with change in the frequency.
<h3>How does the Doppler effect explain the redshift?</h3>
As an object moves away from Earth, the waves moves to the red end of the electromagnetic spectrum and becomes elongated. This results to the increase in wavelength.
Therefore, the explanation for the differences in wavelength observed from earth and a distant star with a shift towards the red end of the spectrum is the redshift-Doppler effect.
Read more on Doppler effect here:
brainly.com/question/4052291
#SPJ1
Answer:
Correct answer is:
A. Canadian Shield
B. Coastal Range
C. Intermountain region
Explanation:
North America is usually divided into eight regions.
As we can see from map Canadian Shield is the largest region, that covers larger part of Canada.
As we can see coastal range is covering territory along the Pacific, while Intermountain region is going along the coastal range.
One thing scientists in the late 1700s could determine about the fossils they were finding were fossils in the upper layers were younger than fossils in lower layers. The correct answer is A.
