redshift and doppler effect
redshift is an increase in the wavelength of radiation emitted by a receding celestial object as a consequence of the Doppler effect and the Doppler effect is a tool used to measure frequency changes as light travels to, from, or pass an observer
Regular because all the sidesare the same
The moon's gravity causes 4 tides every 24 hours. It causes one low and high tide in the morning as well as one low and high tide in the evening.
