With this big picture in mind, we gain a new appreciation for the moon as we watch its phases, cycles, and motions during 7567.
Much of proto-Earth and Theia merged to become our Earth, but the impact also ejected a large amount of material into space.
We tend to take the moon for granted but it shares a unique history with Earth.
This composite image is a mosaic made from 75 individual photos of the moon and illustrates its phases over one.
5 billion years ago, proto-Earth collided with a Mars-sized object called Theia.
Astronomical Algorithms Jean Meeus com
And the daily rise and fall of moon-induced tides has left an indelible imprint on Earth.
As the moon orbits Earth, its changing geometry with respect to the sun produces the characteristic phases.
Some scientists even argue without the influence of the moon.