Evidence for Big Bang Theory

Front

What does the Big Bang theory state about the early universe?

Back

The early universe was small, hot, and dense.

Front

What conclusion can be drawn from the observation that nearly all galaxies are moving away from us?

Back

The once-smaller universe is expanding in all directions.

Front

What is the term for the apparent shift of light wavelengths toward the red end of the spectrum when an object is moving away?

Back

Redshift.

Front

What causes a distant star's light to appear redder than expected?

Back

The star is moving away from Earth, causing its light to increase in wavelength.

Front

How can we best describe the expansion of the universe?

Back

Expansion involves the spreading of matter into infinite and empty space.

Front

What is the significance of redshift in astronomy?

Back

Redshift indicates that an object is moving away from the observer, providing evidence for the expanding universe.

Front

What does the term 'cosmic microwave background radiation' refer to?

Back

It is the afterglow radiation from the Big Bang, filling the universe and providing evidence for the Big Bang theory.

Front

What is the role of dark energy in the universe's expansion?

Back

Dark energy is thought to be responsible for the accelerated expansion of the universe.

Front

What evidence supports the Big Bang theory regarding the abundance of light elements?

Back

The Big Bang nucleosynthesis explains the observed ratios of hydrogen, helium, and lithium in the universe.

Front

What is the Hubble's Law?

Back

Hubble's Law states that the farther away a galaxy is, the faster it is moving away from us.