Why is the comsic background radiation so 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
d) It started as a fixed amount that has been spread out wide across the entirety of the Universe.
The correct answer is (d) it started as a fixed amount that has been spread out wide across the entirety of the Universe.
To understand why the cosmic background radiation is weak today, we need to consider the concept of the Big Bang theory. According to this theory, the Universe began with a hot and dense state, known as the Big Bang. As the Universe expanded, it went through a process called cosmic inflation.
During cosmic inflation, the Universe expanded rapidly, causing it to cool down. As a result, the energy in the form of radiation that was initially present became spread out over a larger volume. This is what led to the weakening of the cosmic background radiation over time.
Today, the cosmic background radiation is still detectable, but its energy has been diluted and spread out across the vast expanse of the Universe. This is why it appears relatively weak compared to the initial state of the Universe after the Big Bang.
It is worth noting that the cosmic background radiation is not absorbed by galaxies (option b) and can indeed be measured by current scientific equipment (option c). The weakening of the cosmic background radiation is primarily due to its expansion and spreading out, as explained in option d.