PHYSICS - Astrophysics - Red Shift

The video explores the concept of the expanding universe, focusing on Edwin Hubble's contributions. It explains how Hubble used the Doppler effect to observe redshift in galaxies, providing evidence for an expanding universe. The video also discusses the Doppler effect, using sound and light examples, and concludes with the implications of redshift for the Big Bang Theory.

What evidence supports the idea that the universe is expanding?

• The presence of black holes

• The rotation of galaxies

• The observation of redshift

• The existence of dark matter

What did Edwin Hubble use to study the light from galaxies?

• The parallax method

• The gravitational lensing effect

• The cosmic microwave background

• The Doppler effect

How does the Doppler effect relate to the light from stars?

• It changes the color of the light based on the star's temperature

• It affects the brightness of the star

• It alters the light's frequency if the star is moving relative to us

• It causes stars to appear larger

What conclusion did Hubble draw from observing redshift in galaxies?

• Galaxies are moving towards us

• Galaxies are shrinking

• Galaxies are stationary

• Galaxies are moving away from us

What theory does redshift provide evidence for?

• The Oscillating Universe Theory

• The Multiverse Theory

• The Big Bang Theory

• The Steady State Theory