What causes a nebula to collapse?

Answers

Answer 1

Answer: Irregularities in the density of the gas causes a net gravitational force that pulls the gas molecules closer together. Some astronomers think that a gravitational or magnetic disturbance causes the nebula to collapse. As the gases collect, they lose potential energy, which results in an increase in temperature.

As the collapse continues, the temperature increases. The collapsing cloud separates into many smaller clouds, each of which may eventually become a star. The core of the cloud collapses faster than the outer parts, and the cloud begins to rotate faster and faster to conserve angular momentum. When the core reaches a temperature of about 2,000 degrees Kelvin, the molecules of hydrogen gas break apart into hydrogen atoms. Eventually the core reaches a temperature of 10,000 degrees Kelvin, and it begins to look like a star when fusion reactions begin. When it has collapsed to about 30 times the size of our sun, it becomes a protostar.

When the pressure and temperature in the core become great enough to sustain nuclear fusion, the outward pressure acts against the gravitational force. At this stage the core is about the size of our sun. The remaining dust envelope surrounding the star heats up and glows brightly in the infrared part of the spectrum. At this point the visible light from the new star cannot penetrate the envelope. Eventually, radiation pressure from the star blows away the envelope and the new star begins its evolution. The properties and lifetime of the new star depend on the amount of gas that remains trapped. A star like our sun has a lifetime of about 10 billion years and is just middle-aged, with another five billion years or so left.

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Please help me......
Suppose that a large river separates two populations of mice. one population is all black, and the other all white. a beaver dam that is built allows the mice to cross the river. over time, many gray mice are born. what is this an example of?

Which abiotic factor is most likely in a desert?a. a primary consumer

b. wind

c. a top predator

d. a snake

Answers

Abiotic means is not or never was living.

b. the wind is not a living thing

Answer:

The correct answer is b. wind.

Explanation:

The wind does not have a heartbeat.

Which are the physical (P), chemical (C), and biological (B) immune responses?P: complement system; C: saliva; B: coughing
P: coughing; C: saliva; B: complement system
P: coughing; C: sneezing; B: complement system
P: complement system; C: saliva; B: sneezing

Answers

The answer is P: coughing; C: saliva; B: complement system.

Coughing is a physical immune response because it mechanically (physically) removes irritants and pathogens from the lungs. Sneezing is also the physical immune response.
Saliva is a chemical immune response because it contains different enzymes able to break down pathogens.
Complement system is a biological immune response because it activates biological molecules, such as antibodies, to remove pathogens from the organism.

Answer:

B)P: coughing; C: saliva; B: complement system. would be your answer

What is the largest object in our solar system? A. Saturn
B. An asteroid
C. Jupiter
D. The Sun

Answers

It is D) The sun.

The sun is the biggest/largest star in our solar system. Its mass is 1.989 kg. Just some amounts bigger than Jupiter.

The largest object in our solar system is the Sun (D).

An orange roughy fish is a fourth-level consumer that requires almost ten times the amount of food available from the primary producers in the ecosystem. Why isn't more energy available from the primary producers?A. Primary producers are not very efficient and lose most of their energy to the environment.
B. There is too much competition from other fourth-level consumers, leaving very little available to the orange roughy.
C. Only a fraction of energy is passed through each level, so there is less available to upper-level consumers.
D. The energy flow is unbalanced and tends to move toward the lower levels.

Answers

The correct answer is option C

The fraction of energy that is available to the fourth level of the ecosystem is very less because the fraction of energy is passed on through each level.

According to the law, only 90% of the energy is transferred through each tropic level and rest of the energy is lost in the form of heat.

Thus, only a fraction of energy reaches the upper tropic level starting from the producers.

C is the correct answer. Remember the 10% rule that only 10% of the energy is passed from one trophic level to the next. Hope this helps!

The basic unit of organization of all organisms is the what? organ, tissue, organelle, or cell.

Answers

It would be a Cell. A Cell is the smallest building block of life. Cell, Tissue, Organelle, then Organ.

Which kingdom contains organisms that are multicellular, heterotrophic, eukaryotic, and lack cell walls?

Answers

Animalia is the correct answer. Hope it helped you. Please mark as the brainliest answer if it helped

Answer:

Animilia

Explanation:

i looked off the other guy

Other Questions

Which of the following sentences from Zora Neale Hurston's "What White Publishers Won't Print" best supports the author's opinion that white Americans perceive educated African Americans as a threat?a. Man, like all the other animals fears and is repelled by that which he does not understand, and mere difference is apt to connote something malign. b. National coherence and solidarity is implicit in a thorough understanding of the various groups within a nation, and this lack of knowledge about the internal emotions and behavior of the minorities cannot fail to bar out understanding. c. The fact that there is no demand for incisive and full-dress stories around Negroes above the servant class is indicative of something of vast importance to this nation. d. I have been amazed by the Anglo-Saxon's lack of curiosity about the internal lives and emotions of the Negroes, and for that matter, any non-Anglo-Saxon peoples within our borders, above the class of unskilled labor. e. Argue all you will or may about injustice, but as long as the majority cannot conceive of a Negro or a Jew feeling and reacting inside just as they do, the majority will keep right on believing that people who do not look like them cannot possibly feel as they do, and conform to the established pattern.

Which statement describes a function of the hormone estrogen

Concerning childbirth, the biggest advantage of regional analgesics versus general sedatives is that the analgesicsa. can be used in conjunction with c-sections, while sedatives cannot.b. last significantly longer.c. have less impact on the baby.d. deaden pain but allow a mother to maintain complete muscle control.