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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
The smallest of the Galilean moons is Amalthea, which is one of Jupiter's moons. It is irregularly shaped and has a reddish color due to its surface composition.
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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.
Yes, Mars has two moons - Phobos and Deimos. They are irregularly shaped and are much smaller compared to Earth's moon.
because the moon always moves
because the moon always moves
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.
The moons of Mars are captured asteroids. They are not spherical, but are irregularly shaped, just like most asteroids.
As of now, 82 moons of Saturn have been discovered. These moons range in size from larger bodies like Titan and Rhea to smaller irregularly shaped moons.
The cone-shaped cells in the eyes detect colours.