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Redshift galaxies

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Sydney Dinh

on 15 November 2013

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Transcript of Redshift galaxies

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Redshift galaxies
Caused by 2 effects
Receading velocity
Photon collisions
The Doppler Effect
The redshift of light from distant galaxies provide evidence that the Universe is?
It provides evidence that the universe is
expanding and keeps expanding

Check your understanding
The redshift of galaxies in the Universe is correctly interpreted as:

A. a Doppler shift due to the motions of the galaxies through expanding space.

B. an "aging" of the light.

C. space itself is expanding with time; the wavelengths of photons are stretched while they travel through the expanding space.

D. the difference in temperatures of distant and nearby galaxies.

Sydney Dinh & Hilary Troyer
Edwin Hubble
Discovered that the
further
a galaxy,
the
faster
it moves away.

Linear correlation:


𝑣: velocity (moving away from Earth)
Ho: Hubble constant (2.3E-18 𝑠^−1)
𝑟: distance to galaxy
The Comptom Effect
Occurs when a photon collides with a free electron
The energy and momentum transfer has an effect on the frequency, which ultimately results in a change of wavelength
Distant galaxies emit waves
as light
A
redshift
occurs whenever a light source moves
away
from an observer
Einstein's theory
theory of gravity
his strong belief in a static universe
Hubble then developped new information (redshift galaxies!)
Check your understanding
The redshift of galaxies in the Universe is correctly interpreted as:

A. a Doppler shift due to the motions of the galaxies through expanding space.

B. an "aging" of the light.

C. space itself is expanding with time; the wavelengths of photons are stretched while they travel through the expanding space.

D. the difference in temperatures of distant and nearby galaxies.

Concept:
Frequency
of sound waves change if the source of sound and the observer are
moving
relative to each other.
THANK YOU!
Full transcript