cuz
The moon's apparent "shape" changes because as it orbits the Earth, the light from the sun hits it at different angles causing observers on Earth to see "different shaped moons". The moon really is always a sphere.
* See link for different definitions of Blue Moon
Yes, stars are shaped like spheres (same with planets and moons).
We only see one part of the surface, at any time the moons faces occur.
The moons of Mars are captured asteroids. They are not spherical, but are irregularly shaped, just like most asteroids.
because the moon always moves
because the moon always moves
The cone-shaped cells in the eyes detect colours.
The cone-shaped cells in the eyes detect colours.
because there are a lot of moons that surround Jupiter and they rotate around Jupiter at different paces not all can be seen at the same time
Any moons that are quite small could be said to be potato shaped, since low mass bodies don't have a high enough gravity to 'pull' their own shape into a sphere. Any moon less than a few hundrend km in diameter will start to look potato shaped. Mars has two small potato shaped moons, while each of the four gas giant planets (Jupiter, Saturn, Uranus and Neptune) have several of them.
Yes, Io one of the many moons of Jupiter is shaped like a pizza.
No. The moon is a lump of rock shaped by gravity.