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I know that the type 1A Supernova stars are ideal to measure distances and to prove...

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Physics

I know that the type 1A Supernova stars are ideal to measuredistances and to prove that the universe is accelerating.

They are standard candles type of stars. Their luminosity willdecline after explosion.  They shine as brightly as anentire galaxy for a few weeks or months then gradually fadeaway.

By analyse the velocity obtained by the redshift and thedistance the star is from us we can assume that the universe isaccelerating.  But if I know the velocity and thedistance, still how can I conclude the universe is accelerating?Plus, what this has to do with dark matter? And is the Universegonna stop expending eventually?

I hope someone can help me with a clear explanation.

Answer & Explanation Solved by verified expert
4.4 Ratings (781 Votes)
Red shift occurs when the wavelength of the light waves are stretched The wavelength of the light from the object going away is redshifted but the key challenge for astronomers is to check if the light they observe has been stretched by the expansion in space In order to accomplish this astronomers use a source which produces a constant    See Answer
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