Describe the experiment that Edwin Hubble conducted, which led to Hubble\'s Law.

Question

Describe the experiment that Edwin Hubble conducted, which led to Hubble's Law. Why might this have led to the wrong value for Hubble's constant? How could one carry out a more precise experiment nowadays? The term red shift is widely used in astronomy. Distinguish the two different types of redshift in astronomy and cosmology, explaining what they correspond to. Using very deep multi-wave length imaging data from the Hubble Space Telescope, astronomers have recently discovered a number of galaxies which could lie at very large distances using the Lyman-break technique. What is the Lyman-break technique? A group in France recently targeted some of these galaxies using the Very Large Telescope in Chile. They found an emission line from one of the galaxies with a wavelength of lambda ob = 1.1673 mu m. Assuming this emission line is the Lyman- alpha line of Hydrogen, with a rest-frame wavelength of lambda rf = 1216A. determine the redshift of this object. The result of (d) indicates this galaxy resides in what is known as the epoch of reionization. Describe what is meant by the term "the epoch of reionization".

Explanation / Answer

B. In physics (especially astrophysics), redshift happens when light seen coming from an object is proportionally increased in wavelength, or shifted to the red end of the spectrum. More generally, where an observer detects electromagnetic radiation outside the visible spectrum, "redder" amounts to a technical shorthand for "increase in electromagnetic wavelength"

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