How are planets created? Main reason that leads to planet creations is Gravity. Planets are formed from gas, comic dust, rocks and any other matter recycled from stars. How is a planet a planet? It needs to meet these three requirements made by the IAU: 1. It needs to be in orbit around the Sun. 2. It needs to have enough gravity to pull itself into a spherical shape. 3. It needs to have “cleared the neighborhood” of its orbit. Meaning it has to be big enough and have a large amount of gravity able to get rid of any object in its orbit. What is the oldest planet discovered? At around 12.7 Billion years old, Methuselah is the oldest planet discovered and is located in the Milky Way amongst a group of first generation stars meaning they're the oldest stars in the universe. Why isn't Pluto a planet? It does not meet the third requirement listed in the question above, making Pluto now a Dwarf Planet. How old is Earth? Earth is 4.54 Billion years old. How do planets get their colour? What the planet is made of and how the surface or atmosphere reflects and absorb sunlight determine the colour of the planet. Why do some planets have rings? The farthest planets away from the sun have a better chance of developing rings; the rings are made partially of frozen gases which aren't able to exist close to the sun. Some say moons help keep trapped the material the planet has caught in its rings. How did planets fall into orbit? The gravity of the sun pulls the planet towards it and into orbit.