ESA Science & Technology03-Aug-2005 11:28:16

Galaxies and the Expanding Universe

Deriving Hubble Constant

By combining the two previous elements we can attempt to calculate the value of the Hubble constant. Hubble's Law can be rewritten as:

If we can measure the redshift of a galaxy and find its distance by another method the value of H0 can, therefore, be calculated.

Standard Candles

Asronomer's use a series of standard candles to measure the distance to galaxies. By having an overlap between the different methods used it is possible to validate each step in the process.

Different methods used to calcualte distances in the universe.

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