unremotelover
Answered

Welcome to Westonci.ca, the ultimate question and answer platform. Get expert answers to your questions quickly and accurately. Explore comprehensive solutions to your questions from a wide range of professionals on our user-friendly platform. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform.

How do scientists know that the universe is expanding?

A: The Doppler effect shows stars with yellow shifted light.
B: The Doppler effect shows stars with blue shifted light.
C: The Doppler effect shows stars with green shifted light.
D: The Doppler effect shows stars with red shifted light.

Sagot :

oviaarian

Answer:

B: The Doppler effect shows stars with blue shifted light.

Explanation:

American astronomer Edwin Hubble and others discovered in the 1920s that the Universe is expanding by showing that most galaxies are receding from the Milky Way — and the farther away they are, the faster they are receding. The roughly constant ratio between speed and distance became known as the Hubble constant. Another explanation is that, Edwin Hubble used the Doppler effect to determine that the universe is expanding. Hubble found that the light from distant galaxies was shifted toward lower frequencies, to the red end of the spectrum. If the galaxies were moving toward Hubble, the light would have been blue-shifted

Answer:

B

Explanation:

We hope you found what you were looking for. Feel free to revisit us for more answers and updated information. We appreciate your time. Please revisit us for more reliable answers to any questions you may have. Westonci.ca is committed to providing accurate answers. Come back soon for more trustworthy information.