Hubble's Law and Redshift Review

Front

What is Hubble's Law?

Back

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

Front

What does a Doppler blue shift indicate?

Back

A Doppler blue shift indicates that an object, such as a star, is moving toward the observer.

Front

What does a Doppler red shift indicate?

Back

A Doppler red shift indicates that an object, such as a galaxy, is moving away from the observer.

Front

How is redshift used in astronomy?

Back

Redshift is used to determine the movement of distant galaxies and to infer the expansion of the universe.

Front

What is the significance of the spectral lines in astronomy?

Back

Spectral lines are unique fingerprints of elements that help astronomers identify the composition and movement of celestial objects.

Front

What does it mean if the spectral lines of a distant galaxy are shifted to the red end of the spectrum?

Back

It means the galaxy is moving away from Earth.

Front

What is the relationship between distance and velocity in Hubble's Law?

Back

Hubble's Law shows a direct relationship: as the distance to a galaxy increases, its velocity (speed of recession) also increases.

Front

What is the cosmic microwave background radiation?

Back

The cosmic microwave background radiation is the afterglow of the Big Bang, providing evidence for the expansion of the universe.

Front

What is the formula for Hubble's Law?

Back

The formula is v = H₀ × d, where v is the velocity of the galaxy, H₀ is Hubble's constant, and d is the distance to the galaxy.

Front

What is Hubble's constant?

Back

Hubble's constant (H₀) is the rate of expansion of the universe, typically measured in kilometers per second per megaparsec.