When a galaxy moves towards the earth, it will emit blue colour light.
Doppler blueshift occurs when the source of light is coming near to its observer. Alternatively, Dopplerredshift occurs when the emitter of light moves away from its observer.
Blueshift occurs when wavelength of light decreases. Redshift occurs when wavelength of light increases.
Blueshift makes the colour of the light move from red towards blue.
The shift in wavelength is determined by observing the spectrum with a spectrometer.
The astrolabe is an inclinometer, that is considered to ba analog calculator that is capable of solving the several different types of the astronomy and is mostly used measuring the altitude and the navigational aspects of the celestial bodies day and night and it was used in the Islamic golden age and the middle ages. It is also helpful in determining the land and the sea latitude.
three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries. A divergent boundary occurs when two tectonic plates move away from each other.