Let's add the moon and animate it to orbit the earth. We will organize this in the hierarchy under a new container object that we'll call Earth-Moon. This way, we can keep the earth and the moon together so later we can move them as a unit (a celestial pair) when they orbit around the sun.
You may wonder why not just make the moon a child object of the earth so they'll move together around the sun? Well, the earth also spins its day-night cycle, and we don't want the moon to inherit that angular rotation, so its orbit is separate.
First, let's create the Earth-Moon container:
- In
Hierarchy, create a new empty object underSolarSystem, namedEarth-Moonand reset itsTransform. - Move
Earthas a child ofEarth-Moon. - Set their positions as follows:
SolarSystem(0,0.75,0),Earth-Moon(0,0,0), andEarth(0,0,0).
The resulting hierarchy is shown in the following screenshot:
