Hubble's law says that the larger the galaxy is, the faster it is receding. all galaxies are expanding. the more distant the galaxy is, the faster it appears to be receding from us. all galaxies that will ever exist already do exist. larger galaxies rotate faster.

Question

Physics

Jimena Carrillo

7 September, 10:37

Hubble's law says that the larger the galaxy is, the faster it is receding. all galaxies are expanding. the more distant the galaxy is, the faster it appears to be receding from us. all galaxies that will ever exist already do exist. larger galaxies rotate faster.

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Cohen Watkins · Answer 1

Answer: the more distant the galaxy is, the faster it appears to be receding from us.

Explanation:

Edwin Powell Hubble was an astronomer who observed several celestial bodies (among which there are the galaxies), and when obtaining the spectra of distant galaxies he observed their spectral lines were displaced towards the red (red shift), whereas the nearby galaxies showed a spectrum displaced to the blue.

From there, Hubble deduced the farther the galaxy is, the faster it appears to be receding from us and the more redshifted it is in its spectrum due to the dilation and contraction of time by speed. In addition, he noted all galaxies are "moving away from each other with a speed that increases with distance", and enunciated the now called Hubble-Lemaître Law.

However, this redshift is not produced by the relative movement of the galaxies with each other. This effect is in fact, due to the own expansion of the space among the galaxies and this is a proof of the fact the universe is in constant expansion.