![]() ![]() ![]() Something similar happens to sound waves when a source of sound moves relative to an observer. The term can be understood literally the wavelength of the light is stretched, so the light is seen as ‘shifted’ towards the red part of the spectrum. Instead, space and matter came into being and started expanding everywhere. ‘Redshift’ is a key concept for astronomers. How come? Well, the Big Bang didn’t happen at any one location. The redshift in wavelength of light emitted by a galaxy is related to its velocity – and other galaxies are rushing from us.īut before you think that the Milky Way is in a super-privileged location at the centre of creation, if we were in the Andromeda Galaxy we would also think we were at the centre. The answer is yes… and the centre is here! For more information, see Creating user-defined functions in the Amazon Redshift Database Developer Guide. Could galaxy redshifts locate the centre of the Universe? It expanded faster than average in the beginning and is expanding faster than average again today. This is because the Universe has not expanded at a constant rate. The redshift of an object is not related to its distance in a simple way. Credit: ESA and the Planck CollaborationĬonversely, a quasar with a redshift of 6 existed when the Universe was 1/7th its current size and the cosmic microwave background radiation – the ‘afterglow’ of the Big Bang fireball – with a redshift of about 1,000, comes from an epoch when the Universe was about 1/1,000th its present size. A snapshot of the Cosmic Microwave Background - heat left over from the Big Bang - when the Universe was just 380,000 years old, as seen by the Planck Telescope. ![]()
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