image 19-October-2017 09:08:13

Stellar motion

Date: 29 November 2013
Satellite: Gaia
Copyright: ESA/ATG medialab

As stars move through our Galaxy, the Milky Way, their positions in our sky change over time.

The movement of a star across the sky is termed 'proper motion'. This provides two of the three components of a star's true velocity. The third component is 'radial velocity' – the movement towards or away from us – can be inferred from the red- or blueshift of its light spectrum.


Last Update: 07 September 2016

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