Which evidence supports the idea that Cosmic Microwave Background radiation is a remnant of the Big Bang?(1 point) Responses Its mass fluctuates greatly. Its mass fluctuates greatly. Its temperature fluctuates greatly. Its temperature fluctuates greatly. Its temperature is uniform. Its temperature is uniform. Its mass is uniform.
Its temperature is uniform.
The evidence that supports the idea that Cosmic Microwave Background (CMB) radiation is a remnant of the Big Bang is that its temperature is uniform. This means that the radiation is evenly distributed across the entire universe and has a nearly constant temperature of around 2.7 Kelvin (-270.45 degrees Celsius or -454.81 degrees Fahrenheit). This uniformity of temperature is consistent with the predictions made by the Big Bang theory, which suggests that the universe was once in a highly dense and hot state before rapidly expanding, leaving behind a residual radiation that has since cooled down.
The evidence that supports the idea that Cosmic Microwave Background (CMB) radiation is a remnant of the Big Bang is that its temperature is uniform.
To understand this, let's break down the explanation step by step:
1. Background: The Big Bang theory suggests that the universe was born from an extremely hot and dense state approximately 13.8 billion years ago. As the universe expanded, it cooled down, allowing the formation of matter and the development of galaxies, stars, and other celestial objects.
2. CMB radiation: The Cosmic Microwave Background radiation is one of the key pieces of evidence for the Big Bang theory. It is a faint, uniform radiation that fills the entire observable universe. This radiation consists of photons (particles of light) that were released when the universe became transparent, about 380,000 years after the Big Bang.
3. Temperature uniformity: One of the significant aspects of CMB radiation is its temperature uniformity. Scientists have observed that the temperature of the CMB is almost precisely the same in all directions of the sky, with only minor fluctuations at different locations.
This uniformity in the CMB's temperature is crucial because it is consistent with the predictions made by the Big Bang theory. According to the theory, the early universe was filled with a hot, dense plasma of elementary particles. As the universe expanded and cooled, the plasma became transparent, allowing the photons to travel freely. This process is known as recombination.
During recombination, the radiation was in thermal equilibrium, meaning it had a uniform temperature throughout the universe. As the universe expanded further, the radiation cooled down without interacting significantly with matter, resulting in the CMB radiation's observed temperature.
So, the fact that the CMB radiation shows a uniform temperature strongly supports the idea that it is indeed the leftover glow from the Big Bang itself, as predicted by the theory. It helps confirm the overall consistency of the Big Bang model and provides valuable evidence for studying the early stages of our universe.