Question

final exam begin date: 12/5/2025 12:01:00 am due date: 12/13/2025 11:59:00 pm end date: 12/13/202
problem 9: (2% of assignment value)
which of the following is pretty good evidence that the universe began with a big bang?
please select the best choice from the available options.
the 3 - degree cosmic microwave background radiation
the fact that galaxies collide
the existence of a double star system like cygnus x - 1
the fact that stars explode
the fact that all the galaxies are moving toward us
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Explanation:

The 3 - degree cosmic microwave background radiation is a key piece of evidence for the Big Bang theory. It is the residual heat from the early universe, which is consistent with the Big Bang model. Galaxies colliding, double star systems, star explosions, and galaxies moving toward us (which is incorrect as most galaxies are moving away) are not strong evidence for the Big Bang. So the correct option is the one about the 3 - degree cosmic microwave background radiation.

Answer:

A. the 3 - degree cosmic microwave background radiation