Why is the cosmic background radiation weak today?
a. the big bang wasn't as powerful as originally suspected
b. the energy from cosmic background radiation is absorbed by galaxies
c. cosmic background radiation cannot be measured by current science equipment
d. it started as a fixed amount that has been spread out wide across the entirety of the universe
d. it started as a fixed amount that has been spread out wide across the entirety of the universe.
The cosmic background radiation, also known as the cosmic microwave background (CMB), originated from the hot and dense early universe. It was emitted when the universe was about 380,000 years old and has been expanding and getting weaker as the universe itself expands. As the universe expands, the CMB radiation gets spread out over a larger area, making it weaker compared to its initial intensity.
The answer is d. It started as a fixed amount that has been spread out wide across the entirety of the universe.
The cosmic background radiation, also known as the cosmic microwave background (CMB), is the remnant radiation from the Big Bang. As the universe expanded and cooled down after the Big Bang, the energy of the radiation spread out and became more diluted, resulting in its weakened intensity today. This radiation is found uniformly throughout the universe and can be detected by modern scientific equipment such as radio telescopes.
The correct answer is d. It started as a fixed amount that has been spread out wide across the entirety of the universe.
The cosmic background radiation, also known as the cosmic microwave background (CMB), is a faint radiation that permeates the universe. It is considered the residual heat left over from the Big Bang, the event that is thought to have given rise to the universe as we know it.
Initially, at the time of the Big Bang, the cosmic background radiation was very strong and intense. However, as the universe expanded over billions of years, the radiation has been stretched and cooled, resulting in a weakening of its energy.
Today, the CMB can be observed as a relatively weak microwave signal coming from all directions in the universe. This weakening of the cosmic background radiation is primarily due to the phenomenon of cosmic expansion, where the universe has continually expanded and spread out the original amount of radiation over a larger volume.
To understand this concept, scientists analyze the characteristics of the cosmic background radiation using specialized instruments and techniques. Advanced detectors, such as those used in space-based missions like the Wilkinson Microwave Anisotropy Probe (WMAP) and the Planck satellite, have been crucial in measuring and mapping this radiation and providing valuable insights into the early universe and its evolution.