Dark Energy & Light: Unlocking the Mystery

In summary, the conversation discusses the topic of dark matter and energy, which makes up 75% of the energy in the universe. The possibility that this dark energy is the same as electromagnetic radiation emitted during the Big Bang is ruled out by the measured temperature of the CMB and the different effects they have on the expansion of the universe.
  • #1
ravisastry
52
0
Hi,

these days. I am reading a lot about dark matter and energy in news papers. i came to know that dark energy/matter constitutes almost 75% of energy of universe ? can it be possible tat, this dark energy is the same as electromagnetic radiation emitted in this universe since big bang ?
 
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  • #2
Nope.

We know very well how much electromagnetic radiation is the universe by measuring the temperature of the CMB. It is about 10^-5 of the density of the universe. There is no plausible mechanism whatsoever to create 100,000 times more radiation. Furthermore, the dark energy acts completely different than radiation. Dark energy accelerates expansion, whereas radiation would decelerate it.
 

1. What is dark energy?

Dark energy is a hypothetical form of energy that is believed to make up about 70% of the total energy in the universe. It is thought to be responsible for the accelerating expansion of the universe, and its exact nature is still not fully understood.

2. How is dark energy different from dark matter?

Dark energy and dark matter are two separate concepts in astrophysics. While dark energy is thought to be a form of energy that permeates all of space and causes the expansion of the universe, dark matter is a type of matter that cannot be directly detected through electromagnetic radiation and is believed to make up about 27% of the universe's total mass.

3. How do scientists study dark energy and light?

Scientists study dark energy and light through various methods, including observations of distant supernovae, measurements of cosmic microwave background radiation, and studies of the large-scale structure of the universe. These methods help to provide insights into the behavior and effects of dark energy and light in the universe.

4. Can dark energy be harnessed for human use?

At this time, there is no known way to harness dark energy for human use. It is a theoretical concept that is still not fully understood, and its effects on the universe are still being studied. However, scientists continue to explore the potential applications of dark energy and its role in the universe.

5. How does dark energy impact our understanding of the universe?

Dark energy is a crucial component in the current understanding of the universe. It helps to explain the observed expansion of the universe and plays a significant role in shaping the large-scale structure of the universe. Its existence also raises many questions about the fundamental nature of space, time, and the laws of physics, making it a crucial area of study for scientists trying to unlock the mysteries of the universe.

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