This model of a realistic exoplanet is one of those gas giants one might expect to find in orbits of far away stars. Similar to our own gas planets like Jupiter or Saturn, the visible colors are created by different types of gas and substances floating in the atmosphere. Thanks to the HD textures and the low poly construction, this model can be used both as a far away background model, as well as a model for close up use.
In real life, this gas planet would have a diameter of around 30.000 km in diameter. Some 3d programs do not display objects of this size very well. In order to avoid complications, and because most users want to decide the exact diameter themselves, the model itself is not scaled to the real life size.