Plannet Struct

This is a Go program that defines a Planet struct and uses it to create a slice of planets. The main function iterates over the slice and prints the name and distance of each planet.

The Planet struct has fields for the planet's name, mass, diameter, distance from the Sun, number of moons, and whether or not it has rings.

In the main function, the program creates a slice of planets and initializes it with data for several planets, including Mercury and Venus. The program then uses a for loop to iterate over the slice, and for each planet, it uses the fmt.Printf function to print a string that includes the planet's name and distance from the Sun in millions of kilometers.