Redshift and the Expanding Universe

The video explores the concept of the expanding universe, focusing on Edwin Hubble's contributions. It explains how Hubble used the Doppler effect and redshift to demonstrate that galaxies are moving away from us, indicating an expanding universe. The video also discusses how light spectra can reveal the chemical makeup and distance of stars. Hubble's observations support the Big Bang theory, providing evidence of the universe's continuous expansion. The video concludes with a call to action for viewers to engage with the content.

What evidence supports the idea that the universe is expanding?

• Cosmic microwave background

• Gravitational waves

• Redshift

• Blue shift

Before Edwin Hubble's work, how did scientists view the universe?

• Infinite and expanding

• Finite and static

• Infinite and static

• Finite and expanding

What can the absorption of specific wavelengths of light tell us about a star?

• Its speed and direction

• Its chemical makeup and distance

• Its age and size

• Its temperature and brightness

What is the Doppler effect in relation to light?

• Change in light direction

• Change in light wavelength and color

• Change in light speed

• Change in light intensity

What happens to the light from a star moving away from us?

• It shifts towards blue frequencies

• It shifts towards red frequencies

• It becomes brighter

• It becomes dimmer

What did Hubble notice about the light from most galaxies?

• It was blue shifted

• It was red shifted

• It was green shifted

• It was unchanged

How does the distance of a galaxy relate to its redshift?

• Distance does not affect redshift

• Further galaxies have less redshift

• Closer galaxies have more redshift

• Further galaxies have more redshift

What conclusion did Hubble draw from his observations of redshift?

• Galaxies are orbiting each other

• Galaxies are moving towards us

• Galaxies are stationary

• Galaxies are moving away from us

What theory does redshift provide evidence for?

• Quantum Theory

• String Theory

• Big Bang Theory

• Steady State Theory

What is the significance of redshift in understanding the universe?

• It shows the universe is static

• It shows the universe is cooling

• It shows the universe is contracting

• It shows the universe is expanding