How is the visible light spectrum used in the doppler effect to give us the approximate age of the universe

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.