8. Our sun is in which phase of its life? Nuclear fusion will burn all of the hydrogen in its core and then it will begin its next phase of life. Astronomers estimate this will be when?
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1 point
Main Sequence; 5 billion years
Protostar; 5 billion years
Main Sequence; 2 billion years
Red Giant; 5 billion years
Main Sequence; 5 billion years
13. In the same simulation, leave the temperature around the middle and adjust the luminosity back and forth. Where would we find a cooler but very bright star on the diagram?
*
1 point
Top left
Top right
Bottom left
Middle
Top right
14. Based on the H-R Diagram, white dwarf stars are not as bright as our sun but their temperature is ________. (HINT: Reset show's our sun's temp around 5800K. Check "show luminosity classes" to find white dwarf stars and click that area on the diagram.)
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1 point
Captionless Image
Hotter
Cooler
The same
Hotter
23. How many stars does Capella consist of?
*
1 point
Captionless Image
1
2
4
6
2
try again
4
To determine the phase of the sun's life and when it is estimated to transition to the next phase, we need to understand the life cycle of a star. Here's how you can get the answer:
1. Start by understanding the basic stages of a star's life cycle. Stars, including our sun, go through several main phases: protostar, main sequence, red giant, and finally, white dwarf (for stars like the sun).
2. The protostar phase is the first stage where a cloud of gas and dust begins to collapse under its own gravity, forming a dense core.
3. The main sequence phase is the longest and most stable phase for stars, including our sun. During this phase, nuclear fusion occurs in the core, where hydrogen atoms combine to form helium, releasing a tremendous amount of energy.
4. The red giant phase comes after the main sequence. As the hydrogen fuel in the core gets depleted, the star expands and becomes much larger, cooler, and redder.
5. Finally, the white dwarf phase occurs when the outer layers of the star are shed, leaving behind a dense, hot core.
Now, let's determine the correct answer to the question:
The statement mentions that "nuclear fusion will burn all of the hydrogen in its core and then it will begin its next phase of life." This suggests that the sun is currently in its main sequence phase, where hydrogen fusion is ongoing.
The options given are:
a) Main Sequence; 5 billion years
b) Protostar; 5 billion years
c) Main Sequence; 2 billion years
d) Red Giant; 5 billion years
Since the sun is currently in the main sequence phase, the correct answer is option c) Main Sequence; 2 billion years. This estimate suggests that the sun is expected to remain in the main sequence phase for approximately another 2 billion years before it undergoes further changes in its life cycle.