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How did Hubble tell the universe was expandining?
By the redshift of the galaxies. In general, the farther away a galaxy is from us, the faster it moves away from us.
What Doppler shift do galaxies show?
Some nearby galaxies move towards us (blueshift), some move away from us (redshift). Galaxies that are farther away all move away from us (redshift); this means that the Universe is expanding.
What is the best evidence the universe is still expanding?
The redshift of distant galaxies, and the fact that the degree of redshift depends on the distance between us and those galaxies. What we observe can only be explained by Hubble Expansion.
What kind of Doppler shift did Hubble observe in these distant galaxies?
Most galaxies exhibit a redshift, meaning that they move away from us.
Supported by observed red shifts in the spectra of galaxies?
This redshift is a strong indication that the Universe is expanding. The only reasonable explanation of this redshift is the Doppler effect, and this means that the galaxies are moving away from us. The greater their distance from us, the faster they move away.
The redshift of galaxies in the universe is correctly interpreted as?
The redshift of galaxies is caused by 3 effects: Doppler effect, Expansion of space and gravitational effects. The further away a galaxy is from us the more it is redshifted (from this it can also be deduced that the further a galaxy is from us the faster it is traveling away from us assuming all galaxies started at the same point - aka 'The Big Bang').In short the interpretation of redshift is both speed and distance from us to the galaxy in question.
How does redshift support the notion of the expanding universe?
The redshift of distant galaxies is believed to be a result of the Doppler effect - in other words, the light is shifted towards lower frequencies ("redshifted") due to the fact that the galaxies move away from us.
An observation of the red shift of galaxies suggest that the universe is?
... expanding. The redshift is attributed to the Doppler effect, meaning that those galaxies are receding, or getting away, from us.
What does the redshift tell us about the universe?
that the universe is expanding.
How and did they figure out about the big bang?
One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.One important clue is the Doppler effect - the redshift of distant galaxies. It turns out that the greater the distance to a galaxy, the faster it moves away from us.
Why is red shift and blue shift important to the earth?
Redshift or blueshift is a change in the frequency of the light you receive, compared to the frequency at which it was emitted. A redshift is a reduction in frequency; this basically means that the object that emits the light is moving away from you.
Why was the big bang theory?
The Big Bang theory was set up to explain observations - for example, the redshift of distant galaxies, which is usually interpreted to mean that the galaxies move away from us.
