Red-shift and the Big Bang

What is red-shift?

Red-shift is the observed increase in the wavelength of light from distant galaxies, shifting it toward the red end of the spectrum.

What does red-shift indicate about a galaxy’s motion?

It indicates that the galaxy is moving away from us.

What is the Doppler effect?

The Doppler effect is the change in frequency or wavelength of waves from a moving source relative to an observer.

What is blue-shift?

Blue-shift occurs when light waves are compressed, indicating an object is moving toward the observer.

How does red-shift support the Big Bang theory?

Red-shift shows that galaxies are moving away from each other, suggesting the universe is expanding.

What is the Big Bang theory?

The Big Bang theory states that the universe began as a single point and has been expanding ever since.

What evidence supports the Big Bang theory?

Evidence includes red-shift and cosmic microwave background radiation.

What is cosmic microwave background radiation (CMB)?

CMB is radiation left over from the early stages of the universe, a key piece of evidence for the Big Bang.

How does the amount of red-shift relate to a galaxy’s distance?

Greater red-shift indicates that a galaxy is farther away and moving faster.

What is Hubble’s Law?

Hubble's Law states that the speed at which a galaxy moves away is proportional to its distance from us.

What does the expansion of the universe mean?

The universe is increasing in size, with galaxies moving away from each other over time.

How does the study of red-shift help astronomers?

Red-shift helps measure the distance and speed of galaxies, providing insights into the universe's expansion.

What is the significance of CMB radiation?

CMB radiation provides evidence for the Big Bang, as it shows the universe was once hot and dense.

How do astronomers detect red-shift?

Astronomers detect red-shift by analyzing the spectrum of light emitted by stars and galaxies.

What does red-shift tell us about the future of the universe?

It suggests that the universe will continue expanding.