Why doesn’t the sun blow itself up?

1 answer:

5 0

An explosion occurs when the timescale for the energy release by some process is much shorter than the timescale on which a system can adjust to damp the energy release process. In the present day Sun, nuclear fusion is a very slow process: on average it takes many billion years for a proton to fuse with another. This timescale is quite temperature dependent, so you might have thought the centre of the Sun might heat up quickly, leading to a runaway "explosion". However, an increase in temperature leads to an increase in pressure that would expand the Sun, reducing the core density and temperature and decreasing the rate of nuclear fusion again. The timescale for the Sun to react in this way is just millions of years, so this acts like a thermostat that keeps the reactions under control.

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

KiRa [710]

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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4 years ago

More of the world's population is now concentrated in heavily populated urban areas known as a _______ .

Vlad [161]

The correct answer is - Megalopolis.

The process of urbanization has been an ever-growing one, especially since the Industrial Revolution appeared on the scene. More and more people have been abandoning the life in the rural areas in order to move in, work, and live in the cities.

The cities grew quickly, and as they were constantly having new people coming in, they started to expand and urbanize the surrounding area. Little by little that led to the creating of whole chains of urbanized space that is connected, stretching for hundreds or even thousands of kilometers. This type of interconnected urban areas are called megalopolises, and they are constantly growing, having more and more of the global population located in them.

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3 years ago

The only major country in the world to use fahrenheit is __________.

Ghella [55]

The United States uses Fahrenheit

7 0

3 years ago

Ammonification

aleksandrvk [35]

Answer:Ammonification is the process by which the organically bound nitrogen of microbial, plant, and animal biomass is recycled after their death. Ammonification is carried out by a diverse array of microorganisms that perform ecological decay services, and its product is ammonia or ammonium ion.

Explanation:

Its pretty obvious what the answer is

4 0

4 years ago

Layers: earth as ___: sun

Alex73 [517]

Answer:

spheres

Explanation:

7 0

3 years ago