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Leviafan [203]
3 years ago
14

When analyzing the speeds of stars far from the galactic center, the orbital speeds of stars ___________ as distance increases f

rom the center increases.
Geography
1 answer:
KiRa [710]3 years ago
6 0

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.

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5 Why did Czar Alexander II free the serfs?
Ivahew [28]

Answer:

I am not entirely sure about this one. But I believe that the "Emancipation Manifesto" signed by Czar Alexander II gave serfs land, or at least gave them the freedom to do what they wanted, like buying that said land.

No freedom of religion, or elections was yet to be had in Russia.

Explanation:

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2 years ago
Direct election of senators to congress occured because of
Vikki [24]
<span>Direct election of senators to Congress occurred because of the 17th constitutional amendment.</span>
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3 years ago
Mention all the continents on Planet,'Earth'.​
lana66690 [7]

Explanation: all the continents on Planet,'Earth':

1. Africa,

2.south America,

3.Antarctica,

4. Asia,

5.Australia,

6. Europe.

7.north America

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2 years ago
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Minerals used as ferroalloys such as chromium are essential to the production of specialty steels. Jet engines used in military
Bumek [7]

The country that would be the best source of chromium for specialty steel production within the United States is South Africa.

This is because South Africa is known to have the highest deposits of chromium, with about 17,000,000 out of the 40,000,000 worldwide.

Also, South Africa was known to have supported the likes of the United States during the Cold War.

Options B and C are wrong because Brazil and Zimbabwe have no chromium deposits.

Option D is wrong because India stylishly supported the Soviet Union during the cold war; hence, they wouldn't have supplied the United States with the Chromium needed.

Also, option E is wrong because Russia forms the larger part of the Soviet Union, and till today they are still not on the same side in most political issues.

Hence, in this case, it is concluded that the correct answer is option A." South Africa."

Learn more here: brainly.com/question/14192117

8 0
2 years ago
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Zina [86]

Answer:

Tectonic Activities in the plates are responsible for the sharp shape of Earth's mountain.

Explanation:

Mountains on the earth are form because of the tectonic activities. Basically FOLD MOUNTAINS are more sharp because they are young and less eroded.

Fold mountains form when two tectonic plates collide with each other, both the plates are light in weight so no plate is ready to go downward, But because of speed and density difference one plate ob duct( obduction is word used for the submergence of continental plate as subduction in case of oceanic plates.). And the plate which is under pushes the upper plate which gives extra push to the mountains formation and result as a sharp peak mountains.

EX:- Himalaya, Andes.

And No such tectonic process takes place on the moon so mountains on moon are once formed and now they are eroding.

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3 years ago
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