Edwin Hubble
Explication
The law describing the proportional relationship between galaxy recession velocity and distance is known as Hubble's Law, named after Edwin Hubble, who discovered this relationship.
Cosmic microwave background radiation observed as a uniform glow
Explication
The cosmic microwave background radiation is considered residual heat from the initial hot, dense state, providing strong evidence that the universe began with the Big Bang. The other options, while relevant to astronomy, do not directly support the universe's expansion.
The residual heat from the early universe
Explication
Cosmic microwave background radiation is the faint glow of thermal radiation filling the universe, which is residual heat from the universe's hot and dense origin, making it strong evidence for the Big Bang theory.
13.8 billion years
Explication
Current estimates based on cosmic measurements and models place the age of the universe at about 13.8 billion years. The other ages are either too young or too old relative to this consensus.
To produce energy through nuclear fusion and support element formation
Explication
The star's life cycle's primary role is to produce energy via nuclear fusion, which powers the star and contributes to element formation, impacting the evolution of galaxies and the universe.
Their velocity away from Earth is proportional to their distance
Explication
Hubble's Law states that the speed at which a galaxy recedes from us increases with its distance, supporting the idea of an expanding universe. The other options do not accurately describe Hubble's Law.
The stretching of light waves to longer, red wavelengths from distant galaxies
Explication
Redshift is the phenomenon where light from distant galaxies is shifted toward red wavelengths, indicating they are moving away from us, which supports the expansion of the universe.
NASA's COBE (Cosmic Background Explorer) in the early 1990s
Explication
NASA's COBE mission was specifically designed to measure the cosmic microwave background radiation, providing key evidence for the Big Bang. The other missions contributed to different areas of space science.
Cosmic microwave background radiation
Explication
Cosmic microwave background radiation is residual heat from the early universe, supporting the idea that it was once hot and dense. Black holes, dark energy, and galaxy rotation are related to other cosmic phenomena but do not directly support this particular aspect.
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Big Bang Evidence — key proof?
Redshift and cosmic microwave background radiation.
Big Bang — definition?
Universe started from a hot, dense state.
Universe Expansion — indicator?
Galaxies receding, shown by redshift.
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