36. what force causes the dust and gas inside a nebula to spiral together?
37. what has to occur for a star to form?
38. what factor determines what the star will become after the main-sequence stage?
39. what three stages will our sun undergo after the main-sequence phase?
40. what does a massive star become after its main-sequence phase?
41. what two types of energy do supernova release?
42. what two objects can be created after the supernova of a high mass star?

Question

Accepted Answer

### Question 36
# Brief Explanations:
The force that causes dust and gas in a nebula to spiral together is gravity. Gravitational attraction pulls the particles of dust and gas in the nebula towards each other, leading to their spiraling and eventual condensation, which is a key process in star formation.
# Answer:
Gravity

### Question 37
# Brief Explanations:
For a star to form, gravitational collapse of the dust and gas within a nebula must occur. The gravitational attraction causes the nebular material (dust and gas) to contract, increasing in density and temperature. When the core temperature and pressure become high enough for nuclear fusion (of hydrogen into helium) to start, a star is born. So the main occurrence is the gravitational collapse of the nebula's dust and gas, leading to nuclear fusion ignition.
# Answer:
Gravitational collapse of the nebula's dust and gas (leading to nuclear fusion ignition)

### Question 38
# Brief Explanations:
The mass of the star (its initial mass) determines what it will become after the main - sequence stage. Lower - mass stars (like our Sun) will follow a different evolutionary path (e.g., red giant, planetary nebula, white dwarf) compared to high - mass stars (which may become red supergiants, go supernova, and then form neutron stars or black holes). The mass dictates the temperature, pressure, and the rate of nuclear reactions, thus shaping the star's future stages.
# Answer:
The star's initial mass

### Question 39
# Brief Explanations:
After the main - sequence phase, our Sun (a low - mass star) will first become a red giant. In this stage, it will expand as the core contracts and hydrogen fusion moves to a shell around the core. Then, it will shed its outer layers, forming a planetary nebula. Finally, the remaining core will become a white dwarf, a dense, hot object that will eventually cool over time.
# Answer:
Red giant, planetary nebula, white dwarf

### Question 40
# Brief Explanations:
After the main - sequence phase, a massive star (with much more mass than the Sun) will become a red supergiant. In this stage, the star expands to a very large size as nuclear fusion processes in its core and shells change, and heavier elements are fused. The red supergiant stage is followed by a supernova explosion, but the immediate stage after main - sequence for a massive star is the red supergiant stage.
# Answer:
Red supergiant

### Question 41
# Brief Explanations:
Supernovas release electromagnetic energy (in the form of light, X - rays, gamma rays, etc.) and kinetic energy (from the explosion itself, which ejects the star's outer layers at high speeds). The electromagnetic energy is emitted across the electromagnetic spectrum, and the kinetic energy is associated with the motion of the ejected material.
# Answer:
Electromagnetic energy and kinetic energy

### Question 42
# Brief Explanations:
After the supernova of a high - mass star, two possible objects that can be created are a neutron star and a black hole. If the remnant core of the star (after the supernova) has a mass between about 1.4 and 3 times the mass of the Sun, it will become a neutron star, a very dense object composed mainly of neutrons. If the core mass is greater than about 3 times the mass of the Sun, the gravitational collapse will be so extreme that a black hole (a region of space with extremely strong gravity from which nothing, not even light, can escape) will be formed.
# Answer:
Neutron star and black hole

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Explanation:

Question 36

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Question 37