What Is the Isotropy (Or Horizon)problem

question 42

Multiple Choice

What is the isotropy (or horizon) problem?

• A) The universe is not as uniform as the standard cosmological model predicts it should be.
• B) If the universe expanded at the rate originally predicted, then the parts we see in opposite directions would never have been in equilibrium with each other and should not exhibit the degree of isotropy we observe.
• C) Without modification, the standard theory suggests that an observer on a distant galaxy would not be able to see our Galaxy because of the intense cosmological redshift.
• D) As we observe galaxies on the "horizon," the farthest distance obtainable, the standard theory predicts that the recessional velocity should approach the speed of light.

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Definitions:

Count-Up Counter

A device or program that tallies an increasing count, often used for tracking occurrences or events.

Non-Retentive Counters

Counting mechanism in automation systems that do not retain their count value in the event of a power loss or system reset.

ACC

In the context of programmable logic controllers, ACC refers to the Accumulator, a register that holds interim arithmetic and logic results.

Time Base

The reference timing signal or scale used in various electronic or digital systems to measure or synchronize the timing of processes or events.