Accelerating Expansion, or Constant?

In summary, the conversation discusses the conflicting information about the expansion of the universe and whether it is accelerating or constant. The person asking the question is unsure due to misinformation, but is hopeful that this site can provide a clear answer. The response states that the universe is indeed accelerating and this is likely due to a positive cosmological constant. The person thanks the expert for the concise and clear answer.
  • #1
IcedEcliptic
85
0
Hello, I'm new here. I have heard from sources that I do not trust that the universe is accelerating its expansion, and alternatively, that it is the same rate of expansion due to a positive cosmological constant. It's very difficult to understand which is the case. There is too much misinformation, but this site it seems, is perfect for answering this question.

Is the universe accelerating its expansion, or is the expansion constant?

Any help would be very much appreciated.

I'm sorry, I see there is another thread of this question. Can I delete this?
 
Last edited:
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  • #2
The expansion of the universe is accelerating, and this is (probably) due to a positive cosmological constant.
 
  • #3
nicksauce said:
The expansion of the universe is accelerating, and this is (probably) due to a positive cosmological constant.

Thank you very much for the concise and and clear answer. :)
 

FAQ: Accelerating Expansion, or Constant?

What is accelerating expansion?

Accelerating expansion refers to the observed phenomenon in which the universe is expanding at an increasing rate over time. This means that the distances between galaxies and other celestial bodies are growing at a faster pace compared to the past.

How is accelerating expansion measured?

Accelerating expansion is measured through various cosmological observations, such as the redshift of distant galaxies and the cosmic microwave background radiation. These observations provide evidence for the expansion of the universe and the rate at which it is accelerating.

What causes accelerating expansion?

The cause of accelerating expansion is currently unknown, but it is believed to be driven by a mysterious force called dark energy. This force is thought to make up about 70% of the energy in the universe and is responsible for the observed acceleration of the universe's expansion.

How does accelerating expansion affect the universe?

Accelerating expansion has a significant impact on the evolution of the universe. It is responsible for the continued expansion and increasing distances between galaxies, which will eventually result in the "heat death" of the universe as all energy is evenly distributed and no new stars or galaxies can form.

Is accelerating expansion constant?

Currently, it is believed that accelerating expansion is not constant but is instead increasing over time. This is supported by observations that show the expansion rate of the universe is accelerating at a faster pace compared to the past. However, further research and data are needed to fully understand the nature of accelerating expansion.

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