There may be ice on some planets that we haven't discovered yet. However, there is ice on Mars and once believed for there to be water.
Another name for inner planets is terrestrial planets. These are the planets that are closer to the Sun and have rocky surfaces.
Rocky planets
dwarf planets
Terrestrial Planets.
It is highly unlikely for planets to form on another planet. Planets typically form from material surrounding a star, not from existing planets. However, moons can form around planets through processes such as accretion or capture.
Planetoids, or minor planets.
Yes we can! And we have! Several planets and moons have water on them!
Terrestrial Planets, or Rocky Planets.
Another name for the terrestrial planets is the inner planets. There are four terrestrial planets: Mercury, Venus, Earth and Mars.
They are also known as the terrestrial planets (they have a 'terrain' or landscape, unlike the outer gas planets. They are also called the Rocky planets.
Unless you are an alien from another star from me, 8 planets, with a small handful of dwarf planets.
Gravity, mainly. The Sun attracts the planets, and - to a lesser degree - the planets attract one another.