Question

final exam begin date: 12/5/2025 12:01:00 am due date: 12/13/2025 11:59:00 pm end date: 12/13/2025 11:59:00 p
problem 5: (2% of assignment value)
in the very distant future, given our best model of the accelerating universe, what will the universe look like?

please select the best choice from the available options.
the entire universe will become one huge black hole
all the stars will die and the galaxies will be dark
galaxies will shine even more brightly than today from all the dark energy
the universe will look pretty much the same as it does today
all the galaxies will start showing blueshifts
submit hint feedback i give up!
1 submission(s) remaining
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Explanation:

To determine the answer, we analyze each option based on the accelerating universe model (driven by dark energy):

• "the entire universe will become one huge black hole": Incorrect. Black holes form from local gravitational collapse, not universal acceleration.
• "all the stars will die and the galaxies will be dark": Correct. In an accelerating universe, stars exhaust fuel over time, and without new star formation (due to expansion and dark energy), galaxies will eventually go dark.
• "galaxies will shine even more brightly...": Incorrect. Dark energy causes expansion, not increased stellar brightness.
• "the universe will look pretty much the same...": Incorrect. Acceleration leads to long - term changes (e.g., star death, galaxy darkening).
• "all the galaxies will start showing blueshifts": Incorrect. Acceleration causes galaxies to move away (redshift), not towards us (blueshift).

Answer:

B. all the stars will die and the galaxies will be dark