cmb
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Definition
Noun: - (Cosmology) The Cosmic Microwave Background: The cooled remnant of the hot Big Bang that fills the entire universe. It is electromagnetic radiation, primarily in the microwave frequency range, that is observable today with an almost uniform temperature of about 2.725 kelvin.
Usage
- The cmb provides a snapshot of the universe when it was only about 380,000 years old.
- Precise measurements of the cmb have been crucial for testing and refining the Big Bang theory.
- Scientists study tiny fluctuations in the cmb to understand the early structure of the cosmos.
Advanced Usage
- "cmb anisotropy": Refers to the tiny, observed variations in the temperature of the cosmic microwave background across the sky. These anisotropies are seeds for the formation of galaxies and large-scale structure.
- The Planck satellite mapped the cmb anisotropy with unprecedented detail.
Variants and Related Words
- Cosmic Microwave Background (CMB): The full, formal name for cmb. This variant is often used interchangeably.
- The discovery of the Cosmic Microwave Background was a major confirmation of the Big Bang model.
- CMB radiation: A compound term specifying the type of emission.
- Instruments must be extremely sensitive to detect the faint signal of CMB radiation.
Synonyms
- Relic radiation: A descriptive synonym emphasizing its origin from the early universe.
- 3K background radiation: An older term referencing its approximate temperature (3 degrees Kelvin).
Related Phrases
- "cmb polarization": Refers to the specific pattern of polarization imprinted on the cosmic microwave background, which can provide information about gravitational waves from the universe's first moments.
- Detecting specific patterns of cmb polarization is a key goal of modern cosmology.
Noun
- (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin