![]() Alternatively, astronomers can seek out similar sized stars to our sun in the solar system and compare the observed spectrum of the stars to that of our sun. The SDSS-III Baryon Oscillation Spectroscopic Survey, now nearly complete, is measuring the three-dimensional cosmic structure with 1.35 million new redshifts. By measuring the difference in the spectrums the astronomers can measure the amount of red shift and thus the amount of expansion of the universe. Krym, If the Redshift Depends on the Pressure then the Acceleration of the Universe Can Be Explained, Journal of Modern Physics, Vol. This is because the astronomers know the elements involved in the explosion and their associated spectrums. By observing the spectrum of a type 1a supernova the astronomers can compare this with the known spectrum at the time of the explosion. Type 1a supernovae always release the same amount of light with the same amount of intensity. ![]() The light produce from these explosions can outshine a whole galaxy for several weeks or months. Supernovae are explosions caused when massive stars collapse under their own gravity. Supernovae are best suited for this or more specifically a type 1a supernova. To do this astronomers use a source which produces a constant source of light, a source for which they can measure the observed spectrum against a known spectrum. The challenge for astronomers is to determine whether the light they observe has been stretched by the expansion in space. Red shift occurs when light waves are stretched. Similarly, when a light wave is compressed and the wavelength shortened the colour shifts towards the blue end of the spectrum phenomenon referred to as Blue Shift. When a light wave is stretched and the wavelength increased the result is a shift towards the red end of the spectrum. Light waves behave in a similar way to sound waves. In Red Shift the observer will see a shift in the observed colour rather than a change in pitch which is observed in the Doppler Effect. Red Shift deals with the movement involved in light waves. The Doppler Effect deals with the movement involved in waves such as sound waves and mechanical waves i.e. ![]() Understanding the Doppler Effect makes it easier to understand Red Shift.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |