Question about Cosmic Background Radiation

In summary, cosmic background radiation is a form of electromagnetic radiation that was first discovered in 1964 by physicists Arno Penzias and Robert Wilson. It is a remnant of the Big Bang and is thought to be the oldest light in the universe. It is significant because it supports the Big Bang theory and provides information about the early universe. It is measured using specialized instruments and is not harmful to humans due to its low levels and even distribution throughout the universe.
  • #1
kauffdiggity
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I was wondering what experiments or observations have shown that the cosmic microwave background radiation exists outside our galaxy in intergalactic space. Have we detected it emanating from sources outside the galaxy? I know we've detected it here on Earth.
 
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Upon its discovery, circa 1965, the CMB was observed come from every direction with the same intensity, without diurnal or seasonal variations. On this basis, scientists concluded the signal had to originate outside our Galaxy. Further study showed it had a perfect blackbody spectrum, ruling out diffuse star light as the source.
 

FAQ: Question about Cosmic Background Radiation

1. What is cosmic background radiation?

Cosmic background radiation is a form of electromagnetic radiation that is present throughout the entire universe. It is a remnant of the Big Bang and is thought to be the oldest light in the universe.

2. How was cosmic background radiation discovered?

Cosmic background radiation was first discovered in 1964 by physicists Arno Penzias and Robert Wilson, who were studying microwave radiation. They found a constant, low-level background noise that could not be explained by any other known source, leading to the discovery of cosmic background radiation.

3. What is the significance of cosmic background radiation?

Cosmic background radiation is important because it provides evidence for the Big Bang theory, which states that the universe began with a huge explosion. It is also used to study the early universe and the formation of galaxies, as it carries information about the conditions of the universe in its early stages.

4. How is cosmic background radiation measured?

Cosmic background radiation is measured using specialized instruments, such as radio telescopes, that can detect and measure microwave radiation. Scientists also use satellites, such as NASA's COBE and WMAP, to map and study the cosmic background radiation in different wavelengths.

5. Can cosmic background radiation be harmful to humans?

No, cosmic background radiation is not harmful to humans. The level of radiation is very low and is spread evenly throughout the universe, so it poses no threat to human health. In fact, we are constantly exposed to low levels of cosmic background radiation from space and natural sources on Earth.

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